Complex sentence: Storms are caused by katabatic wind-concentrated flow of cold air flowing along the steep surface of ice shield towards the sea and accelerated by increasing gradient of the surface of ice and cliff monolith at Cape Denison.
Split into simpler sentences: Storms are caused by katabatic wind, a concentrated flow of cold air moving along the steep surface of the ice shield towards the sea. The air flow is accelerated by the increasing gradient of the surface of ice and the cliff monolith at Cape Denison.