Complex sentence: He attempted to gain a place there by saving Einon, hoping his heart would change the prince's nature and once again unite the races of Man and Dragon; he now fears that his failure will cost him his soul.
Split into simpler sentences: He attempted to gain a place there by saving Einon, hoping his heart would change the prince's nature and once again unite the races of Man and Dragon. He now fears that his failure will cost him his soul.