Complex sentence: R.F. also uses one of Freed's favorite expressions when he says that he "cannot quite visualize it" and has to see it on film first, referring to the Broadway ballet sequence--a joke, since the audience "has" just seen it.
Split into simpler sentences: R.F. also uses one of Freed's favorite expressions when he says that he "cannot quite visualize it" and has to see it on film first, referring to the Broadway ballet sequence. This is a joke, since the audience "has" just seen it.