Complex sentence: She distracts Saki by offering him the chance of redemption without the need for vengeance, which was merely a ruse for a badly hurt Leonardo to escape and for her to attack his mutated heart directly.
Split into simpler sentences: She distracts Saki by "offering him the chance of redemption" without the need for vengeance, which was merely a ruse for a badly injured Leonardo to escape. However, it was a mere ruse for her to attack his mutated heart directly.