Complex sentence: The dentist is able to remove the bad tooth from Del's mouth, and Del, thinking that he can back to his single ways after Raquel left him, foolishly arranges a date with an attractive receptionist named Beverly.
Split into simpler sentences: The dentist is able to remove the bad tooth from Del's mouth. Now thinking that he can back to his single ways after Raquel left him, Del foolishly arranges a date with an attractive receptionist named Beverly.