Complex sentence: She becomes the victim of John's comrades and has to live a lie with Joe not knowing he is an impostor.But behind that lies a secret that she and her mother had, she is barren, a result of an abortion in her earlier years.
Split into simpler sentences: She becomes the victim of John's comrades and has to live a lie with Joe not knowing he is an impostor. Behind that lies a secret that she and her mother maintain, she is barren from an abortion in her earlier years.