Complex sentence: This shape dates back to the 1930s and is based on designs created by Hawley Bowlus, who had earlier overseen construction of Charles Lindbergh's aircraft, the "Spirit of St. Louis".
Split into simpler sentences: This shape dates back to the 1930s and is based on designs created by Hawley Bowlus. Bowlus had overseen construction of Charles Lindbergh's aircraft, the "Spirit of St. Louis".