Complex sentence: Basil tries to bribe Walt not to mention the chain of events which has just taken place, when he reviews the hotel, and immediately goes into hysterics, realizing how much he has just risked the hotel's reputation.
Split into simpler sentences: Basil tries to bribe Walt not to mention the chain of events which has just taken place, when he reviews the hotel. Basil then goes into hysterics, realizing how much he has just risked the hotel's reputation.