Complex sentence: Upon sealing the deal, he kills the caballero and mortally wounds the elder De la Vega, leaving with the money and marks the carriage and surrounding area with the infamous "Z" that Zorro has adapted and is known for.
Split into simpler sentences: Upon sealing the deal, he kills the caballero and mortally wounds the elder De la Vega, leaving with the money. He then marks the carriage and surrounding area with the infamous "Z" that Zorro has adapted and is known for.