Simplify the following text for a Grade 7 native English-speaking person.
Original: The Third DÃ il passed the constitution of the Irish Free State , and after 6 December 1922 , it was the lower house of the Oireachtas of the Irish Free State .
Simplified: The DÃ il of the Irish Republic was succeeded in 1922 by the DÃ il of the Irish Free State .