Complex sentence: She returned to the Indian Territory and taught in the school at Tullahassee, and later in the Carlisle Indian Industrial School in Carlisle, Pennsylvania from 1880 to 1882.
Split into simpler sentences: She returned to the Indian Territory and taught briefly in the school at Tullahassee. Later she taught at the Carlisle Indian Industrial School in Carlisle, Pennsylvania from 1880 to 1882.