Simplify the following text for a Grade 8 native English-speaking person.
Original: It was signed by Chancellor Willy Brandt and Prime Minister JÃ zef Cyrankiewicz at the Presidential Palace on 7 December 1970 , and it was ratified by the German Bundestag on 17 May 1972 .
Simplified: It was signed on December 7 , 1970 and ratified by the German Bundestag on May 17 , 1972 .