Complex sentence: Parsons decorated his new room with a copy of the Stele of Revealing, a statue of the god Pan and his collection of swords and daggers, which he hung on the walls, while he also converted the garage and laundry room into a chemical laboratory.
Split into simpler sentences: Parsons decorated his new room with a copy of the Stele of Revealing, a statue of the god Pan and his collection of swords and daggers, which he hung on the walls. He also converted the garage and laundry room into a chemical laboratory.