Complex sentence: Hastily organizing a militia, the American frontiersmen intercepted and attacked a Red Stick party at Burnt Corn Creek as the latter were returning to the Upper Creek towns with arms purchased from the Spanish in Pensacola in present-day Florida.
Split into simpler sentences: Hastily organizing a militia, American frontiersmen intercepted and attacked a Red Stick party at Burnt Corn Creek. The latter were returning to the Upper Creek towns with arms purchased in Pensacola in present-day Florida.