Complex sentence: He acted as the Commander, Royal Engineers, 5th Australian Division four times between April 1917 and January 1918, and was appointed as a Companion of the Distinguished Service Order for gallantry at the Battle of Polygon Wood.
Split into simpler sentences: He acted as the Commander, Royal Engineers, 5th Australian Division four times between April 1917 and January 1918. Bachtold was appointed as a Companion of the Distinguished Service Order for gallantry at the Battle of Polygon Wood.