Complex sentence: The canton is simultaneously one of the driest regions of Switzerland in its central Rhône valley and among the wettest, having large amounts of snow and rain up on the highest peaks found in Switzerland.
Split into simpler sentences: The canton is one of the drier parts of Switzerland in its central Rhône valley. Paradoxically, it is also one of best-watered parts, having large amounts of snow and rain up on the highest peaks found in Switzerland.