Complex sentence: At the end of the battle, Fahai captured ice harpy using a demon trapper eventually releasing Neng ren from ice, then asking his assistant to confine her at Lei Feng Pagoda and the two of them went back to the door which disappears when it closes.
Split into simpler sentences: At the end of the battle, Fahai captured ice harpy using a demon trapper, eventually releasing Neng Ren from ice. Neng Ren was tasked to confine the ice harpy at Lei Feng Pagoda and the two of them went back to the door which disappears when it closes.