Complex sentence: The screenplay, written by Harry Julian Fink, Oscar Saul, and Peckinpah, was loosely based on historical precedents; however, contrary to claims by the production team at the time, it was not actually based on a true story.
Split into simpler sentences: The screenplay, written by Harry Julian Fink, Oscar Saul, and Peckinpah, was loosely based on historical precedents. However, contrary to claims by the production team at the time, it was not actually based on a true story.