Simplify the following text for a Grade 5 native English-speaking person.
Original: This DÃ il was an extra-legal assembly established by Sinn FÃ in MPs elected to the House of Commons of the United Kingdom in the 1918 United Kingdom general election .
Simplified: The First DÃ il was elected at the British General Election of 1918 . The Sinn FÃ in people who were elected did not go to the House of Commons .