Complex sentence: Dr. Bergon Brokaw, having flown fighter aircraft in the United States Navy in the 1940s and 1950s, set out to create an aircraft with fighter-like performance, and a rear seat to carry his wife, "Buddy".
Split into simpler sentences: Dr. Bergon Brokaw had flown fighter aircraft in the United States Navy in the 1940s and 1950s. He set out to create an aircraft with fighter-like performance, and a rear seat to carry his wife, "Buddy".