Complex sentence: Mick and Mimi allude to a huge barbecue that they hosted at the house the night before, but they hardly reveal any details, except for the fact that Berman, the "party animal," now has a hangover.
Split into simpler sentences: Mick and Mimi allude to a huge barbecue they hosted at the house the night before. However, very few details about the party are given, except for the fact that Berman (the "party animal") now has a hangover.