Complex sentence: Emerging from the tubes and returning to the surface, the Toa Nuva engage in battle against one another to test their new powers, but their actions lead to anger amongst them and all think it best to go their separate ways.
Split into simpler sentences: Emerging from the tubes and returning to the surface, the Toa Nuva engage in battle against one another in order to test their new powers. Their actions lead to anger among them and all think it best to go their separate ways.