Simplify the following text for a Grade 13 native English-speaking person.
Original: When he got there , he was informed that a series of telephone calls had been made by senior opposition figures ( and some independent TDs ) , including Fianna FÃ il leader ( and ex-Taoiseach ) Charles Haughey , Brian Lenihan and Sylvester Barrett demanding that the President , as he could constitutionally do where a Taoiseach had ` ceased to retain the support of a majority in DÃ il Ã ireann ' , refuse FitzGerald a parliamentary dissolution , forcing his resignation as Taoiseach and enabling the DÃ il to nominate someone else for the post .
Simplified: When he got there , he was told that senior opposition figures ( and some independent TDs ) , including Fianna FÃ il leader ( and ex-Taoiseach ) Charles Haughey , Brian Lenihan and Sylvester Barrett had made a series of telephone calls demanding that the President refuse to grant the dissolution . This would force FitzGerald to resign as Taoiseach and allow the DÃ il to nominate someone else for the post .