Simplify the following text for a Grade 9 native English-speaking person.
Original: At this , RuairÃ Ã `` BrÃ daigh led a small walkout , just as he and Sean Mac Stiofain had done sixteen years earlier with the creation of Provisional Sinn FÃ in .
Simplified: This made RuairÃ Ã `` BrÃ daigh lead a small walkout , just as he had done years earlier to create Provisional Sinn FÃ in .