Complex sentence: In August 1441 Branković arrived to Bar where he stayed until the end of the winter 1440/1441 from where he tried to organize forces to recapture territory of the Serbian Despotate he lost to Ottomans.
Split into simpler sentences: In August 1441 Branković arrived to Bar where he stayed until the end of the winter 1440/1441. There he tried to mobilize forces to recapture territory of the Serbian Despotate he lost to Ottomans.