Simplify the following text for a Grade 11 native English-speaking person.
Original: The political system is laid out in the 1949 constitution , the Grundgesetz ( Basic Law ) , which remained in effect with minor amendments after 1990 's German reunification .
Simplified: The political system is set out in the 1949 constitution , the Grundgesetz ( Basic Law ) , which stayed in effect after 1990 's German reunification .