Complex sentence: Hegenberger was assigned to Hickam Field, Hawaii, as operations officer of the 5th Bombardment Group in July 1939, and the following February became operations officer of the 18th Wing at Hickam Field.
Split into simpler sentences: Hegenberger was assigned to Hickam Field, Hawaii, as operations officer of the 5th Bombardment Group. In February 1940, he became operations officer of the 18th Wing at Hickam Field.