Complex sentence: He puts up his London residence for sale and returns to Provence, entering into a relationship with Fanny, while Christie and Francis must reconcile their vastly different philosophies of wine production and jointly run the vineyard.
Split into simpler sentences: He puts up his London residence for sale and returns to Provence, entering into a relationship with Fanny. At the estate, meanwhile, Christie and Francis must reconcile their vastly different philosophies of wine production and jointly run the vineyard.