Complex sentence: Nelson Piquet debuted the car at the Canadian Grand Prix in 1979, and it was developed for the 1980 season allowing Piquet to challenge Alan Jones and Williams hard for the world championship.
Split into simpler sentences: Nelson Piquet debuted the car at the Canadian Grand Prix in 1979. It was then developed for the 1980 season, allowing Piquet to challenge Alan Jones and Williams hard for the world championship.