Answer by taking a quote from the following article:

Richard Lester Meyers (born October 2, 1949), better known by his stage name Richard Hell, is an American singer, songwriter, bass guitarist and writer. Richard Hell was an innovator of punk music and fashion. He was one of the first to spike his hair and wear torn, cut and drawn-on shirts, often held together with safety pins. Malcolm McLaren, manager of the Sex Pistols, credited Hell as a source of inspiration for the Sex Pistols' look and attitude, as well as the safety-pin and graphics accessorized clothing that McLaren sold in his London shop, Sex.

In 1972, Verlaine joined Hell in New York and formed the Neon Boys. In 1974, the band added a second guitarist, Richard Lloyd, and changed their name to Television.  Television's performances at CBGB helped kick-start the first wave of punk bands, inspiring a number of different artists including Patti Smith, who wrote the first press review of Television for the Soho Weekly News in June 1974. She formed a highly successful band of her own, the Patti Smith Group. Television was one of the early bands to play at CBGB because their manager, Terry Ork, persuaded owner Hilly Kristal to book them alongside the Ramones. They also built the club's first stage. Hell started playing his punk rock anthem "Blank Generation" during his time in Television. In early 1975, Hell parted ways with Television after a dispute over creative control. Hell claimed that he and Verlaine had originally divided the songwriting evenly but that later Verlaine sometimes refused to play Hell's songs. Verlaine remained silent on the subject.  Hell left Television the same week that Jerry Nolan and Johnny Thunders quit the New York Dolls. In May 1975, the three of them formed the Heartbreakers (not to be confused with Tom Petty's band, which adopted the same name the following year). After one show, Walter Lure joined the Heartbreakers as a second guitarist. Four Heartbreakers demo tracks, recorded while Hell was still in the band, were later released on that band's L.A.M.F. Definitive Edition reissue. A live album recorded with Hell in 1975 was released as What Goes Around... in 1991.

What year did he leave Television?
In early 1975,