Simplify the following text for a Grade 9 native English-speaking person.
Original: ( Since , there had been two Grands Prix every year in Germany ; the German Grand Prix at Hockenheim , plus either the European Grand Prix or the Luxembourg Grand Prix at the NÃ 1\/4 rburgring . ) From 2007 onwards , the NÃ 1\/4 rburgring and Hockenheimring will alternate hosting the German Grand Prix , starting with the NÃ 1\/4 rburgring in 2007 .
Simplified: Amongst other motor racing events , it holds the annual Formula One German Grand Prix in turns with the NÃ 1\/4 rburgring .