Complex sentence: He served one year at a remote radar site with 100 other GIs at Fort Yukon, Alaska located north of the Arctic Circle before released from active duty to attend the USAFA Prep School and subsequently he received an appointment to at the United States Air Force Academy.
Split into simpler sentences: He served one year at a remote radar site with 100 other GIs at Fort Yukon, Alaska located north of the Arctic Circle before being released from active duty to attend the USAFA Prep School. Subsequently he received an appointment to at the United States Air Force Academy.