Complex sentence: He is later featured as the protagonist of "Metal Gear Solid" prequels where he is initially depicted as an American Special Forces Operator and decorated war hero until political manipulations cause him to be disillusioned, becoming the leader of a rogue band of mercenaries.
Split into simpler sentences: He is later featured as the protagonist of "Metal Gear Solid" prequels where he is initially depicted as an American Special Forces Operator and decorated war hero. Despite his many victories, political manipulations cause him to become disillusioned, becoming the leader of a rogue band of mercenaries.