Complex sentence: But each backer has a mistress he insists be cast in the film, among them the demanding diva Beverly (Sheryl Lee Ralph), the alcoholic flight attendant Patricia (Jean Smart) and the perky blonde Peggy (Tuesday Knight).
Split into simpler sentences: But each backer has a mistress he insists be cast in the film. They are the demanding diva Beverly (Sheryl Lee Ralph), the alcoholic flight attendant Patricia (Jean Smart) and the perky blonde Peggy (Tuesday Knight).