Complex sentence: Secretary of the Air Force Harold Brown, on one of his visits to 17th Air Force at Ramstein, had several briefings by then-Major General Lavelle and was astounded by his detailed knowledge of specifications and functioning of every element of weapons systems and operations.
Split into simpler sentences: Secretary of the Air Force Harold Brown, on one of his visits to 17th Air Force at Ramstein, had several briefings by then-Major General Lavelle. Brown was reportedly astounded by Lavelle's detailed knowledge of specifications and functioning of every element of weapons systems and operations.