Original: However the slow pace of developments , contributed in part to the ( wider ) political difficulties of the British government of John Major and consequent reliance on Ulster Unionist Party votes in the House of Commons , led the IRA to end its ceasefire and resume the campaign .
Simplified: However the IRA ended its ceasefire because of the slow pace of developments , partly because British prime minister John Major needed the votes of the Ulster Unionist Party in the House of Commons .