Complex sentence: After a brief period of imprisonment at Fortress Monroe at Hampton Roads, Virginia, the Sac and Fox warriors were allowed to return to Iowa, where they occupied a small reservation allotted their people by the Treaty of Fort Armstrong.
Split into simpler sentences: After a brief period of imprisonment at Fortress Monroe at Hampton Roads, Virginia, the Sac and Fox warriors were allowed to return to Iowa. Together with their people, they occupied a small reservation in Iowa allotted by the Treaty of Fort Armstrong.