Complex sentence: Bas-Armagnac is one of the three terroirs (plantation areas) in the Armagnac area where grapes for the distillation of the Armagnac eau-de-vie can be cultivated, it extends over the Landes and Gers departments and represents 57% of the vineyards.
Split into simpler sentences: Bas-Armagnac is one of the three plantation areas in the Armagnac area where grapes for the distillation of the Armagnac eau-de-vie can be cultivated. It extends over the Landes and Gers departments and represents 57% of the vineyards.