Complex sentence: In 2005, the club was listed on the National Register of Historic Places; and in 2014 it was further designated a National Historic Landmark in recognition of its importance to Tillinghast's career as a course designer.
Split into simpler sentences: In 2005, the club was listed on the National Register of Historic Places. In 2014 it was further designated a National Historic Landmark in recognition of its importance to Tillinghast's career as a course designer.