Complex sentence: Her child was retrieved by a Lt. Anderson after the battle, and taken to the surgical tent where its arm was amputated and the child brought to Prairie du Chien where it was believed to have recovered.
Split into simpler sentences: Her child was retrieved by a Lt. Anderson after the battle, and taken to the surgical tent where its arm was amputated. The child was then taken to Prairie du Chien where it was believed to have recovered.