Complex sentence: Irene leads the protagonist on an anemon journey to the now-lush Sahara, where he is re-united with Helen; through psychic visions the two come to understand that Helen is the lost Theresa reincarnated.
Split into simpler sentences: Irene leads the protagonist on an aerial journey to the now-lush Sahara, where he is re-united with Helen. Through psychic visions, the two come to understand that Helen is the lost Theresa reincarnated.