Complex sentence: Once defeated, Paragon is "truely defeated" by Trema, whom appears after it's defeat at the hands of the part, and delivers a series of punches to the Weapon, destroying it.
Split into simpler sentences: Once defeated, Paragon is "truely defeated" by Trema, whom appears after it's "defeat" at the hands of the party. Trema appears and delivers a series of punches to the Weapon, destroying it.