Complex sentence: Historians call the movie both the worst and best of films: the worst for the historical inaccuracies in a film Scott promoted as historically accurate, and the best for the film's accurate depiction of the people and violence of the late second century AD.
Split into simpler sentences: Historians call the movie both the worst and best of films. The worst for the historical inaccuracies in a film Scott promoted as historically accurate, and the best for the film's accurate depiction of the people and violence of the late second century AD.