Complex sentence: By 1290 the gord had lost its strategic importance and ceased to exist as a castellany and in 1299 the whole area had been bought by the Cistercian order and was owned by them until 1810.
Split into simpler sentences: By 1290 the gord had lost its strategic importance and ceased to exist as a castellany. In 1299 the whole area was purchased by the Cistercian order and was owned by them until 1810.