Complex sentence: His sledgehammer at this point is implied to partake of the power of the Orb much as the sword of Iron Grip carried by Garion and the awesome power of the three defeats Nahaz, banishing him to Hell, and causing him to take Urvon with him.
Split into simpler sentences: His sledgehammer at this point is implied to partake of the power of the Orb, much as the sword of Iron Grip carried by Garion. The awesome power of the three defeats Nahaz, banishing him to Hell, and causing him to take Urvon with him.