Complex sentence: The screenplay, written by Gene Brewer and Charles Leavitt, is based on a novel of the same name by Brewer about a psychiatric patient who claims to be an alien from the planet K-PAX.
Split into simpler sentences: The screenplay, written by Gene Brewer and Charles Leavitt, is based on the novel of the same name. The story revolves around a psychiatric patient who claims to be an alien from the planet K-PAX.