Complex sentence: As Zen-Aku, he battled them on several occasions until the Power Rangers learned the truth and helped free him from the curse, with help from the Rhino and Armadillo Wild Zords.
Split into simpler sentences: As Zen-Aku, he battled them on several occasions. The fighting went on until the Power Rangers learned the truth and helped free him from the curse, with help from the Rhino and Armadillo Wild Zords.