Complex sentence: He systematically searched the parking lot, train station, and small apartment complex, ultimately finding Genovese, who was lying, barely conscious, in a hallway at the back of the building, where a locked doorway had prevented her from entering the building.
Split into simpler sentences: He systematically searched the parking lot, train station, and small apartment complex. Eventually he found Genovese who was lying, barely conscious, in a hallway at the back of the building where a locked doorway had prevented her from entering the building.