Complex sentence: In fact, Tai Lung was the only one (third to Oogway and Shifu) to know the Nerve Attack, and believed that he was destined to become the Dragon Warrior, making it his aim in life.
Split into simpler sentences: In fact, Tai Lung was the only one (third to Oogway and Shifu) to know the Nerve Attack. He believed that he was destined to become the Dragon Warrior, and made it his aim in life.