Complex sentence: With partner Nelli Zhiganshina, he is a four-time German national champion (2007,2011--2013), has won twelve international medals, and has placed as high as 6th at the European Championships and 10th at the World Championships.
Split into simpler sentences: With partner Nelli Zhiganshina, he is a four-time German national champion (2007,2011--2013) and has won twelve international medals. They have placed as high as 6th at the European Championships and 10th at the World Championships.