Original: Éamon de Valera, by now Leader of the Opposition also did not attend, being represented by a senior Fianna Fáil figure who was a member of the Church of Ireland, Erskine Childers, a future President of Ireland himself.
Simplified: Éamon de Valera, by now Leader of the Opposition, was represented by a senior Fianna Fáil figure who was a member of the Church of Ireland, Erskine Childers, a future President of Ireland himself.