Complex sentence: During the initial stages of his career, Kuipers refereed the 2006 UEFA European Under-17 Championship Final between Czech Republic and Russia in Luxembourg and also the 2009 UEFA European Under-21 Championship final between Germany and England in Sweden.
Split into simpler sentences: During the initial stages of his career, Kuipers refereed the 2006 UEFA European Under-17 Championship Final between Czech Republic and Russia in Luxembourg. He was also the referee in the 2009 UEFA European Under-21 Championship Final between Germany and England in Sweden.