Complex sentence: The Huron tried to break the Iroquois Confederacy by negotiating separate peaces with the Onondaga and the Cayuga, but the other tribes intercepted their messengers, putting an end to the negotiations.
Split into simpler sentences: The Huron tried to break the Iroquois Confederacy by negotiating separate peaces with the Onondaga and the Cayuga. When the other tribes intercepted their messengers, they put an end to the negotiations.