Original sentence: The county of Périgord dates back to when the area was inhabited by the Gauls, itw as home to four tribes, the name for "four tribes" in the Gaulish language was "Petrocore"
Edited sentence: The county of Périgord dates back to when the area was inhabited by the Gauls, it was home to four tribes, the name for "four tribes" in the Gaulish language was "Petrocore"