Complex sentence: Cleese, throughout the sketch, walks in a variety of silly ways (including one that briefly imitates the scissor gait of spastic diplegia), and it is these various silly walks, more than the dialogue, that has earned the sketch its popularity.
Split into simpler sentences: Cleese, throughout the sketch, walks in a variety of silly ways. It is these various silly walks, more than the dialogue, that has earned the sketch its popularity.