Complex sentence: The Indians attacked a wagon train 22 January, driving away the escort, but Captain Bernard, 1st Cavalry, came up with reinforcements and the Indians were repulsed, losing one killed and many wounded.
Split into simpler sentences: The Indians attacked a wagon train on 22 January, driving away the escort. However, Captain Bernard, 1st Cavalry, came up with reinforcements and the Indians were repulsed, losing one killed and many wounded.