Complex sentence: However, Leon emerges the victor from the battle and takes the false eye from the corpse of the deceased Mendez, which he then uses to get past the retinal scanner on the gate to Salazar's castle.
Split into simpler sentences: However, Leon emerges the victor from the battle and takes the false eye from the corpse of the deceased Mendez. Which he then uses to get past the retinal scanner on the gate to Salazar's castle.