 Complete the following phrase:  Before the Second World War Mercedes-Benz competed in the European Championship, winning three titles. The marque debuted in Formula One in . After winning their first race at the 1954 French Grand Prix, driver Juan Manuel Fangio won another three Grands Prix to win the 1954 Drivers Championship and repeated this success in . Despite winning two Drivers Championships, Mercedes-Benz withdrew from motor racing after 1955 in response to the 