Complex sentence: His parents were then living in Villeneuve-sur-Lot, but his mother, a "bigourdane", gave birth to him at her family's hometown of Ossun, in the canton of Hautes-Pyrénées.
Split into simpler sentences: His parents were then living in Villeneuve-sur-Lot. His mother, a "bigourdane", gave birth to him at the family home in Ossun, in the canton of Hautes-Pyrénées.