Complex sentence: Zor, who came to Optera to study the Invid Flowers of Life, seduced the Regis and took from her knowledge of the Flowers' secret before abandoning her and the Invid.
Split into simpler sentences: Zor, who came to Optera to study the Flowers of Life. Regis was seduced by Zor, who took from her knowledge of the Flowers' secret before abandoning her and the Invid.