Complex sentence: The general has the Ghost Squadron--so named because it does not officially exist--in their P-51 Mustangs lead the dragons into a trap made up of a whole lot of flak guns.
Split into simpler sentences: The general has the Ghost Squadron, so named because it does not officially exist. In their North American P-51 Mustangs, the squadron leadS the dragons into a trap made up of numerous flak guns.