Complex sentence: So in the end, Cheng was forced to marry Yoyo, who was 18 at the time, tending to a contract that they will divorce within a year, and no sexual relationship will occur.
Split into simpler sentences: So in the end, Cheng is forced to marry Yoyo, who is 18 at the time. They make a contract that they will divorce within a year and no sexual relationship will occur.