Complex sentence: Mitzi is a police informer and conducting an affair at the same time with the chief of police-which leaves Bratfisch, Rudolf's loyal private cab driver and a popular entertainer--apparently at a "notorious tavern".
Split into simpler sentences: Mitzi is a police informer and conducting an affair at the same time with the chief of police. Which leaves Bratfisch, Rudolf's loyal private cab driver and a popular entertainer--apparently at a "notorious tavern".