Simplify the following text for a Grade 13 native English-speaking person.
Original: The Constitution of the German Reich ( German : Die Verfassung des Deutschen Reiches ) , usually known as the Weimar Constitution ( Weimarer Verfassung ) was the constitution that governed the Weimar Republic ( 1919-1933 ) .
Simplified: The Constitution of the German Reich , usually known as the Weimar Constitution ( Weimarer Verfassung ) was the constitution that governed Germany during the Weimar Republic ( 1919 â `` 1933 ) .