Complex sentence: Keith Maurice Ellison (born August 4,1963) is an American politician, currently serving as the U.S. Representative for since 2007 and Deputy Chair of the Democratic National Committee since 2017.
Split into simpler sentences: Keith Maurice Ellison (born August 4,1963) is an American politician. He has been the U.S. Representative for since 2007 and Deputy Chair of the Democratic National Committee since 2017.