Complex sentence: Jai's soldiers then attempt to scale the wall using their spears as ladders, but are repulsed: trap doors on the wall skewer a majority of the men and the men on top of the wall loose volleys of arrows.
Split into simpler sentences: Jai's soldiers then attempt to scale the wall using their spears as ladders, but are repulsed. Trap doors on the wall skewer a majority of the men and the men on top of the wall loosed volleys of arrows.