Simplify the following text for a Grade 7 native English-speaking person.
Original: The central institution of the republic was DÃ il Ã ireann , a unicameral assembly formed by the majority of Irish Members of Parliament elected in the 1918 general election .
Simplified: This was DÃ il Ã ireann . It was made up of the majority of Irish Members of Parliament elected in the 1918 general election .