Complex sentence: This rapid increase in drag led aerodynamicists and aviators to disagree on whether supersonic flight was achievable until the sound barrier was broken for the first time in 1947 using the Bell X- 1 aircraft.
Split into simpler sentences: This rapid increase in drag led aerodynamicists and aviators to disagree on whether supersonic flight was achievable. The sound barrier was broken for the first time in 1947 using the Bell X- 1 aircraft.