Complex sentence: In the spring of 1942, the Aircraft Detection Corps volunteers received received manila envelopes with a letter from L.E. Emerson, Commissioner of Defence for Newfoundland stating that "Aircraft Identity Corps Newfoundland" would be reorganized as an instrument of the Royal Canadian Air Force.
Split into simpler sentences: In the spring of 1942, the Aircraft Detection Corps volunteers received received manila envelopes. Each envelope had a a letter from L.E. Emerson, Commissioner of Defence for Newfoundland stating that "Aircraft Identity Corps Newfoundland" would be reorganized as an instrument of the Royal Canadian Air Force.