Complex sentence: Spawn's main weapon is the Agony Axe (which is formed by his scape) can cut through any demon and Spawn's melee weapon is his trademark chains, they attack with snakelike accuracy and speed.
Split into simpler sentences: Spawn's main melee weapon is the Agony Axe (which is formed by his scape) which can cut through any demon. Spawn also has his trademark chains, which attack with snakelike accuracy and speed.