Complex sentence: In the early 1970s, Connolly made the transition from folk-singer with a comedic persona to fully fledged comedian, and is now considered by many to be the greatest stand-up comedian of all time.
Split into simpler sentences: In the early 1970s, he made the transition from folk-singer with a comedic persona to fully fledged comedian. Connolly is considered by many to be the greatest stand-up comedian of all time.