Complex sentence: In the Middle Ages, Kivrin can only watch while all the people she has come to know die from the Black Death, the last being Father Roche, the priest who found her when she was sick and brought her to the manor.
Split into simpler sentences: In the Middle Ages, Kivrin can only watch while all the people she has come to know die from the Black Death. The last is Father Roche, the priest who found her when she was sick and brought her to the manor.