 Complete the following phrase:  It was not until 19 September 1954 that this shorter track hosted a non-championship Formula One race. This Grand Prix of Berlin was mainly a show dominated by the Mercedes-Benz W196 drivers Karl Kling the winner and Juan Manuel Fangio. No serious competition was present, as many teams had refused to show up and the German Grand Prix was still held on the Nürburgring. Finally AVUS hosted its only world championship Formula One race with the 