Complex sentence: With actors from The Performance Group, including Willem Dafoe and Elizabeth LeCompte, Gray helped to co-found the theater company The Wooster Group from 1975 to 1980 before leaving the company to focus on his own monologue work.
Split into simpler sentences: With actors from The Performance Group, including Willem Dafoe and Elizabeth LeCompte, Gray helped to co-found the theater company The Wooster Group. He worked with them from 1975 to 1980 before leaving the company to focus on his own monologue work.