Complex sentence: He was also a poet, a lyricist for operas and musicals, and a playwright with an off-Broadway play, "A Power of Dreams" in which Anne Meara of Stiller and Meara starred.
Split into simpler sentences: He was also a poet, a lyricist for operas and musicals, and a playwright. His play, "A Power of Dreams", was produced off-Broadway with Anne Meara of Stiller and Meara starred.