Complex sentence: At lower speeds, the performance is similar to the Decathlon while at full power it exhibits performance similar to the Pitts S-2--the Pitts has a 60 hp edge, but the aerodynamic and clean design of the Extra makes it comparable in performance.
Split into simpler sentences: At lower speeds, the performance is similar to the Decathlon. However, at full power it exhibits performance similar to the Pitts S-2--the Pitts has a 60 hp edge, but the aerodynamic and clean design of the Extra makes it comparable in performance.