Complex sentence: Champlain deliberately went along with a war party down Lake Champlain, and further, this battle created 150 years of mistrust that poisoned any chances that French-Iroquois alliances would be durable and long lived.
Split into simpler sentences: Champlain deliberately went along with a war party down Lake Champlain. Furthermore, this battle created 150-years of mistrust that poisoned any chances that French-Iroquois alliances would be durable and long lived.