Complex sentence: Rudy was sent to Mittelbau-Dora to work in a missile factory where he joined a group of prisoners who tried to sabotage the production system by urinating or throwing sand into the guidance systems.
Split into simpler sentences: Rudy was sent to Mittelbau-Dora to work in a missile factory. He joined a group of prisoners who tried to sabotage the production system by urinating or throwing sand into the guidance systems.