Complex sentence: The fictional career of Morty Fineman (Stiller) includes having made 427 films, although it is not specified as to whether he directed them all or if it refers to films produced or written by the Fineman character.
Split into simpler sentences: The fictional career of Morty Fineman (Stiller) is said to have made 427 films. It is not specified as to whether he directed them all, or if it refers to films produced or written by the Fineman character.