Complex sentence: Davies would take over as CO of the 3rd BG while three other senior pilots from the 27th would become CO's of the 8th, 13th and 90th Squadrons while remaining officers and enlisted men were assigned to the four squadrons of the 3rd BG.
Split into simpler sentences: Davies would take over as CO of the 3rd BG while three other senior pilots from the 27th would become CO's of the 8th, 13th and 90th Squadrons. The officers and enlisted men were assigned to the four squadrons of the 3rd BG.