Complex sentence: Patrons were not allowed to return to Sex Garage to retrieve their possessions or look for friends and the police began beating the patrons after one partygoer, Bruce Buck, went back to get his leather jacket.
Split into simpler sentences: Patrons were not allowed to return to Sex Garage to retrieve their possessions or look for friends. It is believed that one partygoer, Bruce Buck, was the first person to be assaulted after he tried to go back into the venue to retrieve his leather jacket.