Complex sentence: Sinn Féin is the largest Irish republican political party and was closely associated with the Provisional IRA, with the Irish Government alleging that senior members of Sinn Féin have held posts on the IRA Army Council.
Split into simpler sentences: Sinn Féin is the largest Irish republican political party and was closely associated with the Provisional IRA. The Irish Government alleged that senior members of Sinn Féin have held posts on the IRA Army Council.