Complex sentence: The title was originally used by Larry McMurtry for a screenplay that he wrote with Peter Bogdanovich, but which never materialized as a movie, so he rewrote as the original "Lonesome Dove".
Split into simpler sentences: The title was originally used by Larry McMurtry for a screenplay that he wrote with Peter Bogdanovich, but which never materialized as a movie. He rewrote as the original "Lonesome Dove".