Complex sentence: Under these conditions, the Council notably fought against the Iroquois Confederacy and the Sioux, during the Seven Years' War, the Council fought against England and during the Northwest Indian War and the War of 1812, against the United States.
Split into simpler sentences: Under these conditions, the Council notably fought against the Iroquois Confederacy and the Sioux. During the Seven Years' War, the Council fought against England; and during the Northwest Indian War and the War of 1812, they fought against the United States.