Complex sentence: Professor Grady Tripp (Michael Douglas) is an author who teaches creative writing classes while having an affair with Sara Gaskell (Frances McDormand), who is the chancellor of the unnamed Pennsylvania university, and also the wife of the chairman of the English department.
Split into simpler sentences: Professor Grady Tripp (Michael Douglas) is a novelist who teaches creative writing at an unnamed Pennsylvania university. He is having an affair with university chancellor Sara Gaskell (Frances McDormand), who is married to the chairman of the English department.