Complex sentence: The Axis powers also possessed air superiority, as Soviet Karelian was only protected by the 1st and 55th Mixed Air Divisions, totaling 273 serviceable aircraft, which were considered to be heavily outclassed by their enemy counterparts.
Split into simpler sentences: The Axis powers also possessed air superiority, as Soviet Karelian was only protected by the 1st and 55th Mixed Air Divisions, totaling 273 serviceable aircraft. These were considered to be heavily outclassed by their enemy counterparts.