Complex sentence: The film features the screen debut of dancer Fred Astaire, who appears as himself and dances with Crawford, and also presents dancing robots which later appeared in the first Gene Autry serial, "The Phantom Empire".
Split into simpler sentences: The film features the screen debut of dancer Fred Astaire, who appears as himself and dances with Crawford. It also featured dancing robots which later appeared in the Gene Autry serial "The Phantom Empire".