Complex sentence: The Station is not commanded by an air rank officer (Air Commodore and above) despite a large number of the stations personnel being of air rank; whereas most stations would usually commanded by a Group Captain, High Wycombe is usually commanded by a Wing Commander.
Split into simpler sentences: The station is not commanded by an air rank officer (Air Commodore and above) despite a large number of the station's personnel being of air rank. Whereas most stations would usually be commanded by a Group Captain, High Wycombe is usually commanded by a Wing Commander.