sentences:  This was shortly after the creation of Matra-Sports and Ducarouge started work on their Formula 3 programme, and from 1966 he also began improving their Formula 2 cars.He steadily rose within the organisation to head of operations, where he designed the Cosworth-powered Matra MS10 and MS80, the latter winning the 1969 Formula One World Championship with Jackie Stewart; Ducarouge then masterminded Matra’s hat-trick of Le Mans wins from 1972–74.At the end of 1974, Matra pulled out of racing.