Complex sentence: After that he used Panavision equipment, which he had first used on "Klute" returning to use Mitchells on "The Godfather Part II" (1974) to retain the visual coherence of the two films.
Split into simpler sentences: After that he used Panavision equipment, which he had first used on "Klute". Willis went back to using Mitchells on "The Godfather Part II" (1974), in orer to retain the visual coherence of the two films.