Complex sentence: A search of the bank deepens the mystery as the robbers weapons turn out to be plastic replicas, there is no body of the dead hostage, and no money or valuables appear to have been stolen.
Split into simpler sentences: A search of the bank deepens the mystery as the robbers' weapons turn out to be plastic replicas. There is no body of a dead hostage, and no money or valuables appear to have been stolen.