Complex sentence: Angela Dorothea Merkel (Kasner; born 17 July 1954) is a German politician and former research scientist who has been the Chancellor of Germany since 2005 and the Leader of the Christian Democratic Union (CDU) since 2000.
Split into simpler sentences: Angela Dorothea Merkel (Kasner; born 17 July 1954) is a German politician and former research scientist. Merkel has been the Chancellor of Germany since 2005, and the Leader of the Christian Democratic Union (CDU) since 2000.