Complex sentence: To indulge Pete, Wolfe has Archie contact the police with the car's description and license plate, but the next day, Sgt. Purley Stebbins arrives at the brownstone, demanding to know the identity of Wolfe's source.
Split into simpler sentences: To indulge Pete, Wolfe has Archie contact the police with the car's description and license plate. The next day, Sgt. Purley Stebbins arrives at the brownstone, demanding to know the identity of Wolfe's source.