Complex sentence: Though he traveled to Lexington, Virginia, where he remained for the duration of the war, due to ill health, he never served with Confederate forces, but instead took the oath of allegiance to the Union imposed by the martial law authority.
Split into simpler sentences: Though he traveled to Lexington, Virginia, where he remained for the duration of the war. Due to ill health, he never served with Confederate forces, but instead took the oath of allegiance to the Union imposed by the martial law authority.