Complex sentence: Papin proposed applying this steam pump to the operation of a paddlewheel boat and tried to market his idea in Br Hunabsuccessfully convert the piston motion into rotary motion and the steam could not produce enough pressure.
Split into simpler sentences: Papin proposed applying this steam pump to the operation of a paddlewheel boat and tried to market his idea in Britain. He was unable to successfully convert the piston motion into rotary motion and the steam could not produce enough pressure.