Complex sentence: In fact by 1953 the Chevy had smoothed out the sides to a straighter look except for the "air-foil" near the rear wheels, and had wrap-around glass as the back window.
Split into simpler sentences: In fact by 1953 the Chevy had advanced to smoothed out straight side panels for a straighter side look, except for the "air-foil" near the rear wheels. The 1953 Chevy made other gains such as wrap-around glass as the back window.