Complex sentence: In the case of "Gun Crazy" (1950), based on a short story by MacKinlay Kantor, the author was the front for Trumbo's screenplay; it was not until 1992 that Trumbo's role was revealed.
Split into simpler sentences: In the case of "Gun Crazy" (1950), based on a short story by MacKinlay Kantor, the author was the front for Trumbo's screenplay. It was not until 1992 that Trumbo's role was revealed.