Complex sentence: After working as a playwright with the Works Progress Administration, acting on stage, and directing hundreds of plays, Ritt was a successful television director until 1952, at the peak of McCarthyism, when he was blacklisted and could no longer work in TV.
Split into simpler sentences: After working as a playwright with the Works Progress Administration, acting on stage, and directing hundreds of plays, Ritt became a successful television director. In 1952, at the peak of McCarthyism, he was blacklisted and could no longer work in TV.