Original sentence: The Police Service of Northern Ireland (PSNI) and the British and Irish governments claimed the Provisional Irish Republican Army (IRA) was responsible (or had permitted others to undertake the raid), a claim vehemently denied by the Provisional IRA itself and the political party Sinn Féin
Edited sentence: The Police Service of Northern Ireland (PSNI) and the British and Irish governments knew the Provisional Irish Republican Army (IRA) was responsible (or had permitted others to undertake the raid) to fund a pension to convince members to commit to peace, a claim vehemently denied by the Provisional IRA itself and the political party Sinn Féin