Complex sentence: Griffin Mill (Tim Robbins) is a Hollywood producer with a studio executive girlfriend Bonnie Sherow (Cynthia Stevenson) whose job is to hear story pitches from screenwriters and decide which films have the potential to get made and which films get rejected.
Split into simpler sentences: Griffin Mill (Tim Robbins) is a Hollywood producer with a studio executive girlfriend Bonnie Sherow (Cynthia Stevenson). Mill's job is to hear story pitches from screenwriters and decide which films have the potential to get made and which films get rejected.