Complex sentence: He is defeated when Constantine manages to'summon' Satan to collect him by committing suicide, Satan destroying Gabriel's wings and banishing Mammon back to Hell, stating that he prefers to wait and see Earth come to him on its own.
Split into simpler sentences: He is defeated when Constantine manages to summon Satan to collect him by attempting suicide. Satan then destroys Gabriel's wings and banishes Mammon back to Hell, stating that he prefers to wait and see Earth come to him on its own.