Complex sentence: Genghis Khan is outraged by this and decides that he wants Nora to have his child but she is in love with Tony, a young Italian and so gets Dora to marry Ghengis in her place.
Split into simpler sentences: Genghis Khan is outraged by this and decides that he wants Nora to have his child. But she is in love with Tony, a young Italian, and so gets Dora to marry Ghengis in her place.