Complex sentence: He then served as deputy commanding officer, United States Army Special Operations Command, and upon selection as a general officer, he served as both ADC for support and maneuver in the 3rd Infantry Division, Germany.
Split into simpler sentences: He then served as deputy commanding officer of United States Army Special Operations Command. After his selection as a general officer, he served as both ADC for support and maneuver in the 3rd Infantry Division, Germany.