Complex sentence: There are very few towns or villages of any size on the Plateau de Millevaches, but the towns of Meymac, Felletin and Eymoutiers are situated at the edges of the Plateau.
Split into simpler sentences: There are very few towns or villages of any size on the Plateau de Millevaches. But the towns of Meymac, Felletin and Eymoutiers are situated at the edges of the Plateau.