Complex sentence: The "tramontane" inland wind from the northwest often accentuates the dry climate; drought is the most common threat to vine production, with French AOC and European Union regulation prohibiting the use of irrigation.
Split into simpler sentences: The "tramontane" inland wind from the northwest will often accentuate the dry climate. Drought is the most common threat to vine production with French AOC and European Union regulation prohibiting the use of irrigation.