premise: John Wellborn Root (January 10, 1850 – January 15, 1891) was an American architect who was based in Chicago with Daniel Burnham. He was one of the founders of the Chicago School style. Two of his buildings have been designated a National Historic Landmark; others have been designated Chicago landmarks and listed on the National Register of Historic Places. In 1958, he received the AIA Gold Medal.
hypothesis: John Wellborn Root won a medal in 1957.
reason: It said he won that specific medal in 1958, but it is possible he won a different medal in 1957. There are many different contests and medals to be won, so he may have won a different one a year earlier, there is no way to know for sure from the passage.