"The supernatural origin of the Scythian nation, from the union of Hercules and the monstrous Echidna, is set aside by him for the more probable account that they were a nomad tribe driven by the Massagetae from Asia; and he appeals to the local names of their country as proof of the fact that the Kimmerians were the original possessors."

By "they" he means "Scythian nation", "Kimmerians" also refer to "Scythian nation" right? "Driven by... from..." stands for "expelled by... from..." right?
Therefore "Scythian nation" also refers to people as well as land?
errr.. nevermind that lol