Complex sentence: Fort Kearny learned of the fight from its observation station on Pilot Hill and about 11:30 a.m.103 soldiers under the command of Major Benjamin Smith sallied out of the fort to relieve the soldiers in the wagon boxes.
Split into simpler sentences: Fort Kearny learned of the fight from its observation station on Pilot Hill. About 11:30 a.m., 103 soldiers under the command of Major Benjamin Smith sallied out of the fort to relieve the soldiers in the wagon boxes.