Complex sentence: It is the oldest continuously active USAF major command, originally activated on 1 February 1942 at Langley Field, Virginia, as the Eighth Air Force, by the United States Army Air Forces.
Split into simpler sentences: It is the oldest continuously active USAF major command. It was originally activated on 1 February 1942 at Langley Field, Virginia, as the Eighth Air Force, by the United States Army Air Forces.