Complex sentence: During the War of 1812, he served as an adjutant in a Cherokee regiment and took part in fighting under General Andrew Jackson at the Battle of Horseshoe Bend against the British-allied Upper Creek warriors, known as the Red Sticks.
Split into simpler sentences: During the War of 1812, he served as an adjutant in a Cherokee regiment. He took part in fighting under General Andrew Jackson at the Battle of Horseshoe Bend against the British-allied Upper Creek warriors, known as the Red Sticks.