Complex sentence: Grant, while driving a Jeep through the park, is attacked by the T-Rex after the power goes out and with his Jeep wrecked he must now make his way to the Visitors Center to escape.
Split into simpler sentences: Grant, while driving a Jeep through the park, is attacked by the "Tyrannosaurus rex" after the power goes out. With his Jeep now wrecked, he must now make his way to the Visitors Center to escape.