Complex sentence: But "Mutt" still holds to this day, the world record of 54, for "Prototype First Flights", even outstripping Test Pilot and Astronaut- "Neil Armstrong" on prototype first flights, general types, and flying hours.
Split into simpler sentences: But "Mutt" still holds to this day, the world record of 54, for "Prototype First Flights". Even outstripping Test Pilot and Astronaut- "Neil Armstrong" on prototype first flights, general types, and flying hours.