Complex sentence: His defeat of this overwhelmingly large foe caused Hogan to add a fourth demandment--believing in yourself, and he also became known as "The Immortal" Hulk Hogan.
Split into simpler sentences: His defeat of this overwhelmingly large foe caused Hogan to add a fourth demandment: believing in yourself. He also became known as "The Immortal" Hulk Hogan.