Complex sentence: Russell reappears in the same location in which he gave his opening monologue, with the revelation that he is not in a cell but hiding in a small room behind a fake wall the robbers had constructed inside the bank's supply room.
Split into simpler sentences: Russell reappears in the same location in which he gave his opening monologue. He is revealed to have been hiding in a small room behind a fake wall the robbers had constructed inside the bank's supply room.