Complex sentence: Martin was the deputy commander of 36th Medical Group at Andersen, and the other crew members were all from the 20th Bomb Squadron or the 96th Bomb Squadron at Barksdale Air Force Base, Louisiana.
Split into simpler sentences: Martin was the deputy commander of 36th Medical Group at Andersen. The rest of the crew members were from the 20th Bomb Squadron or the 96th Bomb Squadron at Barksdale Air Force Base, Louisiana.