Simplify the following text for a Grade 12 native English-speaking person.
Original: Irish Taoiseach Albert Reynolds , who had replaced Haughey and who had played a key role in the Hume\/Adams dialogue through his Special Advisor Martin Mansergh , regarded the ceasefire as permanent .
Simplified: The new Irish Taoiseach ( prime minister ) Albert Reynolds had played a key role in the Hume\/Adams talks through his Special Advisor Martin Mansergh , thought the ceasefire as permanent .