Complex sentence: Martigny is located at a crossroad between Italy, France and Switzerland, one road linking this town over the Great St. Bernard Pass to Aosta (Italy), and the other one, over the col de la Forclaz to Chamonix (France).
Split into simpler sentences: Martigny is located at a crossroad between Italy, France and Switzerland. One road links it over the Great St. Bernard Pass to Aosta (Italy), and the other over the col de la Forclaz to Chamonix (France).