Complex sentence: On May 8,1918 he received his Reserve Military Aviator rating and was commissioned as a Second Lieutenant in the Signal Officer's Reserve Corps and served as in the Air Service as an instructor pilot at Ellington Field for the remainder of the war.
Split into simpler sentences: On May 8,1918 he received his Reserve Military Aviator rating and was commissioned as a Second Lieutenant in the Signal Officer's Reserve Corps. Hamilton served as in the Air Service as an instructor pilot at Ellington Field for the remainder of the war.