Complex sentence: After the 1701 peace treaty with the French, the Iroquois remained mostly neutral even though during Queen Anne's War (North American part of the War of the Spanish Succession) they were involved in planned attacks against the French.
Split into simpler sentences: After the 1701 peace treaty with the French, the Iroquois remained mostly neutral. During Queen Anne's War (North American part of the War of the Spanish Succession), they were involved in planned attacks against the French.