Complex sentence: Denny was a well known actor in silent films and with the advent of Talkies he became a character actor and later made frequent appearances in television during the 1950s and 60's.
Split into simpler sentences: Denny was a well known actor in silent films and with the advent of Talkies he became a character actor. Later, Denny made frequent appearances in television during the 1950s and 60's.