Complex sentence: Superman kisses Lois before Zod and Superman fight, a battle which causes mass destruction to Metropolis, and ends in Zod forcing Superman to kill him, or risk the death of innocent bystanders.
Split into simpler sentences: Superman kisses Lois before Zod and Superman fight, a battle which causes mass destruction to Metropolis. Zod forces Superman to kill him or risk the death of innocent bystanders.