Complex sentence: It was first established in 1939 as U.S. Army Air Corps as Ladd Field and transferred to the newly established U.S. Air Force in 1947 and renamed Ladd AFB, a cold weather station to test aircraft under arctic conditions.
Split into simpler sentences: It was first established in 1939 as U.S. Army Air Corps as Ladd Field. In 1947 it was transferred to the newly established U.S. Air Force and renamed Ladd AFB, serving as a cold weather station to test aircraft under arctic conditions.