Complex sentence: Brendan Fraser was supposed to appear in "My Long Goodbye" as Ben because Carla asks Dr. Cox if he had ever seen a ghost, however, Fraser couldn't appear because he was currently filming a movie.
Split into simpler sentences: Brendan Fraser was supposed to appear in "My Long Goodbye" as Ben because Carla asks Dr. Cox if he had ever seen a ghost. However, Fraser couldn't appear because he was currently filming a movie.