Complex sentence: She finds herself trapped in the body of a young daughter of a Manchu aristocrat, Ma'ertai Ruoxi, a younger sister of Ma'ertai Ruolan, who is a concubine of the emperor's eighth son, Yinsi.
Split into simpler sentences: She finds herself trapped in the body of a young daughter of a Manchu aristocrat, Ma'ertai Ruoxi. In this new period, she is a younger sister of Ma'ertai Ruolan, who is a concubine of the emperor's eighth son, Yinsi.