Complex sentence: He was among the cavalrymen ordered to capture Chief Big Foot who, on December 29,1890, surrounded the Sioux camp on Wounded Knee Creek with the intention of arresting the Sioux chieftain and disarming his followers.
Split into simpler sentences: He was among the cavalrymen ordered to capture Chief Big Foot. On December 29,1890, troopers surrounded the Sioux camp on Wounded Knee Creek with the intention of arresting the Sioux chieftain and disarming his followers.