Complex sentence: HQAC controls two Air Cadet National Adventure Training Centres--at Llanbedr, Gwynedd, Wales and Windermere, Cumbria, England, which provide a range of adventure training courses and accommodation for squadron and wing expeditions.
Split into simpler sentences: HQAC controls two Air Cadet National Adventure Training Centres--at Llanbedr, Gwynedd, Wales and Windermere, Cumbria, England. These provide a range of adventure training courses and accommodation for squadron and wing expeditions.