Complex sentence: Nathanael Greene Herreshoff I (March 18,1848--June 2,1938), was an American naval architect and mechanical engineer, was a yacht design innovator, and produced a succession of undefeated America's Cup defenders between 1893-1920.
Split into simpler sentences: Nathanael Greene Herreshoff I (March 18,1848--June 2,1938), was an American naval architect and mechanical engineer. "Captain Nat," as he was known, revolutionized yacht design, and produced a succession of undefeated America's Cup defenders between 1893-1920.