Simplify the following text for a Grade 9 native English-speaking person.
Original: Dr. Kurt Schumacher ( 13 October 1895 - 20 August 1952 ) , was the leader of the Social Democratic Party of Germany from 1945 to 1952 .
Simplified: Dr. Kurt Schumacher ( born 13 October 1895 in Kulm , West Prussia ( now CheÅ mno in Poland ) - died 20 August 1952 in Bonn ) was a German politician .