Complex sentence: The oldest of Michael Landon's nine children, Mark appeared in three movies, including the CBS television movie, "Us" (1991), which was written and directed by Michael Landon shortly before his death in 1991.
Split into simpler sentences: The oldest of Michael Landon's nine children, Mark appeared in three movies. One of which was the CBS made for television movie "Us" (1991), which was written and directed by Michael Landon shortly before the actor's death in 1991.