Complex sentence: Diabolik scales the walls of Saint Just Castle where he finds the police are waiting, Diabolik manages to steal the necklace by fooling the police officers with mirrors on the road and dummy decoys of himself.
Split into simpler sentences: Diabolik scales the walls of Saint Just Castle where he finds the police are waiting. He manages to steal the necklace by fooling the police officers with mirrors on the road and dummy decoys of himself.