Complex sentence: Robert Adams (1906--1965) was a pioneering black actor, on the stage, TV and films, as well as the founder and director of the Negro Repertory Arts Theatre, one of the first professional Black theatre companies in Britain.
Split into simpler sentences: Robert Adams (1906--1965) was a British actor, of stage, and screen. He was the founder and director of the Negro Repertory Arts Theatre, one of the first professional Black theatre companies in Britain.