Complex sentence: At the theater where Kitty is appearing Max is the best-dressed man in April's party, but later at a nightclub Kitty exposes him, and he is deserted by his society friends.
Split into simpler sentences: At the theater where Kitty is appearing, Max is the best-dressed man in April's party. At a nightclub later that night, reveals Max's true identity and he is deserted by his society friends.