Answer the question at the end by quoting:

Francis Albert Sinatra was born on December 12, 1915, in an upstairs tenement at 415 Monroe Street in Hoboken, New Jersey. He was the only child of Italian immigrants Antonino Martino "Marty" Sinatra and Natalina "Dolly" Garaventa. Sinatra weighed 13.5 pounds (6.1 kg) at birth and had to be delivered with the aid of forceps, which caused severe scarring to his left cheek, neck, and ear, and perforated his ear drum, damage that remained for life. Due to his injuries at birth, his baptism at St. Francis Church in Hoboken was delayed until April 2, 1916.
Sinatra attempted to pursue an acting career in Hollywood in the early 1940s. While films appealed to him, being exceptionally self-confident, he was rarely enthusiastic towards his own acting, once remarking that "pictures stink". Sinatra made his film debut in 1941, performing in an uncredited sequence in Las Vegas Nights, singing "I'll Never Smile Again" with Tommy Dorsey's The Pied Pipers. In 1943 he had a cameo role along with Duke Ellington and Count Basie in Charles Barton's Reveille with Beverly, making a brief appearance singing "Night and Day". The following year he was given his leading roles in Higher and Higher and Step Lively for RKO Pictures.  In 1945, Metro-Goldwyn-Mayer cast Sinatra opposite Gene Kelly and Kathryn Grayson in the Technicolor musical Anchors Aweigh, in which he played a sailor on leave in Hollywood for four days. A major success, it garnered several Academy Award wins and nominations, and the song "I Fall in Love Too Easily", sung by Sinatra in the film, was nominated for the Academy Award for Best Original Song. In 1946, Sinatra briefly appeared at the end of Richard Whorf's commercially successful Till the Clouds Roll By, a Technicolor musical biopic of Jerome Kern, in which he sang "Ol' Man River.  In 1949, Sinatra co-starred with Gene Kelly in the Technicolor musical Take Me Out to the Ball Game, a film set in 1908, in which Sinatra and Kelly play baseball players who are part-time vaudevillians. He teamed up with Kelly for a third time in On the Town, playing a sailor on leave in New York City. Today the film is rated very highly by critics, and in 2006 it ranked No. 19 on the American Film Institute's list of best musicals. Both Double Dynamite (1951), an RKO Irving Cummings comedy produced by Howard Hughes, and Joseph Pevney's Meet Danny Wilson (1952) failed to make an impression. The New York World Telegram and Sun ran the headline "Gone on Frankie in '42; Gone in '52".

Were there other reasons for his career slump?

Meet Danny Wilson (1952) failed to make an impression.

IN: Serebro (Russian: Serebro; English translation: Silver) (Stylized as SEREBRO) is a Russian girl group formed by their manager and producer Maxim Fadeev.

After the decline of their success after "Mama Lover", the group started to record songs for their third studio album. In January 2013, the group announced that they would release their further material in Japan after signing with EMI Music. They also announced that they plan to release a compilation entitled Serebration that includes songs from their first and second studio albums. The group traveled to Japan to promote the compilation album and to do a live concert tour.  In March 2013, the group released their promotional single "Sexy Ass", but it failed to chart in Russia. In June 2013, the group released their single "Mi Mi Mi" which charted in Italy, peaking at 5 on the Italian iTunes chart. In July 2013, the group released the song "Malo Tebya". The song was released on Russian radio airplay on 10 July and marked a welcome return to the top ten in Russia for the band, ultimately peaking at number five. A new collaboration with DJ M.E.G., entitled "Ugar" (Ugar), has premiered on the band's Facebook page and the Promo DJ website on 18 September. The group announced that they signed a deal with Republic Records and Universal Music Group and discussed plans to re-release their single "Mi Mi Mi" as their first international single.  On 28 September, member Anastasia Karpova confirmed her planned departure from the group. Karpova had told Fadeev months prior that she intended to leave the group. She noted that the decision was mutual with other members of the band and that her primary motivation was to pursue a solo career. A new member, named Dasha Shashina, was announced on 3 October 2013. Shashina had re-recorded Anastasia's recordings in the group's songs "Malo Tebya" and "Ugar", which is expected to release a video with Shashina featuring in it.  Temnikova left the group in May 2014, ahead of her planned December exit, after having become pregnant. Karpova temporarily returned until newest member Polina Favorskaya was introduced on June 5, 2014.  Serebro's 3rd studio album '925' was supposed to be released on iTunes Russia on 15 October 2015 but due to their studio harddrive being stolen, the album release had to be cancelled.

Aside from Serebration what other plans did they have

OUT:
In March 2013, the group released their promotional single "Sexy Ass", but it failed to chart in Russia.