Complex sentence: Jean-Claude Juncker (born 9 December 1954) is a Luxembourgish politician who since 2014 has been President of the European Commission, one of the main institutions of the European Union.
Split into simpler sentences: Jean-Claude Juncker (born 9 December 1954) is a Luxembourgish and European politician. Since 2014, Juncker has been President of the European Commission, one of the main institutions of the European Union.