Complex sentence: The result, illustrated initially at Yonne, and later at Château de Farcheville, produced a characteristic quadrangular layout, four large, circular corner towers, but lacked a keep, which was not needed to support this design.
Split into simpler sentences: The result, illustrated initially at Yonne, and later at Château de Farcheville, was a characteristic quadrangular layout with four large, circular corner towers. It lacked a keep, which was not needed to support this design.