Complex sentence: Field activities of many support commands operated under a "bureau" structure, with both policy and operating functions vested in staff officers who often exercised command and policy authority without responsibility for results, a system held over from the Air Corps years.
Split into simpler sentences: Field activities of many support commands operated under a "bureau" structure, with no separation of policy and operating functions. Staff officers often exercised command and policy authority without responsibility for results, a system remaining from the Air Corps years.