Complex sentence: Third stories were added to all three sides of Garden Quadrangle in 1728, masking the flourishes of Wren's original French-style design; the dining hall was also refitted circa 1774, with Baroque replacing the earlier Gothic style.
Split into simpler sentences: Third stories were added to all three sides of Garden Quadrangle in 1728, masking the flourishes of Wren's original French-style design. The dining hall was also refitted circa 1774, with Baroque replacing the earlier Gothic style.