Complex sentence: On 1 March 1938 his commission as pilot officer was confirmed and in May 1938 he joined the No.7 Armament Training Station in Northumberland to engage in formation flying aerial gunnery and bombing practice.
Split into simpler sentences: On 1 March 1938 his commission as pilot officer was confirmed. In May 1938 he joined the No.7 Armament Training Station in Northumberland to engage in formation flying aerial gunnery and bombing practice.