Complex sentence: The Sentry arrives and attacks the Hulk, leading to a massive prolonged battle that nearly destroys Manhattan that leaves them spent to their human forms, with Bruce Banner delivering the final punch, thus defeating Robert Reynolds.
Split into simpler sentences: The Sentry arrives and attacks the Hulk, leading to a prolonged battle that leaves them spent. They revert to their human forms, with Bruce Banner delivering the final punch, thus defeating Robert Reynolds.