Complex sentence: Questel returned as her voice in 1944, starting with the cartoon "The Anvil Chorus Girl"; she would remain so until after the King Features Syndicate made-for-TV "Popeye" shorts in 1960.
Split into simpler sentences: Questel returned as her voice in 1944, starting with the cartoon "The Anvil Chorus Girl". Questel would remain so until after the King Features Syndicate made-for-TV "Popeye" shorts in 1960.