Complex sentence: First Air Force (1 AF)/Air Forces Northern (AFNORTH) is a numbered air force (NAF) in Air Combat Command (ACC) and the headquarters for the Air Force component of United States Northern Command.
Split into simpler sentences: First Air Force (1 AF) (now AFNORTH) is a numbered air force (NAF) in Air Combat Command (ACC). The First Air Force also serves as the Air Force component of the United States Northern Command, and Air Forces Northern (AFNORTH), the Air Force warfighting headquarters supporting United States Northern Command.