Complex sentence: As the monks prepare Gui's prisoners at the stake, William and Adso reenter the secret library, and there, they come face to face with the Venerable Jorge, the most ancient denizen of the abbey.
Split into simpler sentences: As the monks prepare Gui's prisoners at the stake, William and Adso reenter the secret library. There, they come face to face with the Venerable Jorge, the most ancient denizen of the abbey.