Complex sentence: The Union Army, specifically the 3d Cavalry Regiment, had launched a reconnaissance mission and stopped at the town of Canada Alamosa to build a camp next to the village, consisting of a corral and breastworks, to subdue a possible and immediate Confederate counter attack.
Split into simpler sentences: The Union Army, specifically the 3d Cavalry Regiment, had launched a reconnaissance mission and stopped at the town of Canada Alamosa to build a camp next to the village. The camp consisted of a corral and breastworks, to subdue a possible and immediate Confederate counter attack.