Complex sentence: Sturgis men were exhausted and anticipated a rest after they crossed the Yellowstone River on the morning of September 13, but Crow scouts reported the Nez Perce were moving up Canyon Creek six miles away.
Split into simpler sentences: Sturgis men were exhausted and anticipated a rest after they crossed the Yellowstone River on the morning of September 13. But Crow scouts reported the Nez Perce were moving up Canyon Creek six miles away.