Complex sentence: The film opens with a live-action prologue, with intertitles that boast of McCay as "the originator and inventor of Animated Cartoons", and boasts of 25,000 drawings needed to complete the film.
Split into simpler sentences: The film opens with a live-action prologue. Intertitles boast of McCay as "the originator and inventor of Animated Cartoons", and of the 25,000 drawings needed to complete the film.