Complex sentence: That afternoon, he slipped out of his hotel and he drove back to San Francisco, and hid in the theater's basement, dressed as a maintenance man, and smoking his pipe as he waited patiently.
Split into simpler sentences: That afternoon, he slipped out of his hotel and he drove back to San Francisco. He hid out in the theater's basement, dressed as a maintenance man, and smoking his pipe as he waited patiently.