Complex sentence: During this time he started writing songs for the antiwar musical "Anthems in E-flat" starring Mark Hamill and for the films, Cockfighter and Zandy's Bride, starring Liv Ullmann and Gene Hackman.
Split into simpler sentences: During this time he started writing songs, starting with the antiwar musical "Anthems in E-flat" starring Mark Hamill. He also composed music for the films, Cockfighter and Zandy's Bride, starring Liv Ullmann and Gene Hackman.