Original sentence: April 10 - Good Friday: the British and Irish governments and all the Northern parties sign an historic peace agreement.August 15 - At least 21 people die in a bomb explosion near the centre of Omagh, County Tyrone.June 25 - The people of Northern Ireland go to the polls to elect a new Assembley.May 22 - The Good Friday Agreement is endorsed in a referendum by people North and South
Edited sentence: April 10 - Good Friday: the British and Irish governments and all the political parties in the six counties (except the Democratic Unionist Party sign an historic peace agreement.August 15 - 29 people die in a bomb explosion near the centre of Omagh, County Tyrone, caused by the Real IRA.June 25 - The people of the six counties go to the polls to elect a new Assembly.May 22 - The Good Friday Agreement is endorsed in a referendum by people north and south of the border