Complex sentence: On her return to Montreal, she found that the attacks of the Iroquois threatened the colony and lent the hospital money to M. de Maisonneuve who returned to France to organize a force of one hundred men for the colony's defense.
Split into simpler sentences: On her return to Montreal, she found that the attacks of the Iroquois threatened the colony. She loaned the hospital money to M. de Maisonneuve, who returned to France to organize a force of one hundred men for the colony's defense.