Complex sentence: He looks up in horror to see a painted picture of Father Time on the ceiling; hanging from the figure is a gigantic pendulum with a crescent razor measuring "one feet from horn to horn", swinging slowly back and forth.
Split into simpler sentences: He looks up to see a painted picture of Father Time on the ceiling. Hanging from the figure is a gigantic pendulum with a crescent razor measuring "one feet from horn to horn," and swinging slowly back and forth.