Complex sentence: The western side, from Luz-Saint-Sauveur, is 19km long, climbing 1,404m at an average of 7.4 per cent with a maximum of 10.2 near the summit.
Split into simpler sentences: The western side, from Luz-Saint-Sauveur, is 19km long. Over this distance, the climb is 1,404m, an average of 7.4% with a maximum of 10.2% near the summit.