Complex sentence: Hewdraw is sent to the Overworld by Medusa as her retaliation for Dark Lord Gaol's defeat, one of his decapitated heads eventually growing into a new one-headed Hewdraw which is defeated by Pit again.
Split into simpler sentences: Hewdraw is sent to the Overworld by Medusa as her retaliation for Dark Lord Gaol's defeat. One of Hewdraw's decapitated heads eventually grows into a new one-headed Hewdraw which is defeated by Pit again.