Complex sentence: During the French and Indian War, an extension in North America of the Seven Years' War in Europe, Native tribes allied with either the French or British, often depending on trading priorities, and warred with each other and the colonists.
Split into simpler sentences: During the French and Indian War, an extension in North America of the Seven Years' War in Europe. Indian tribes allied with either the French or British, often depending on trading priorities, and warred with each other and the colonists.