Complex sentence: In 1949, he was quoted as saying that Joseph McCarthy was "insane" and this led to him being unofficially blacklisted in Hollywood, and returning to Broadway, until a comeback in films in the late 1950's.
Split into simpler sentences: In 1949, he was quoted as saying that Joseph McCarthy was "insane" and this led to him being unofficially blacklisted in Hollywood. He returned to Broadway, until a comeback in films in the late 1950's.