Complex sentence: The name has also been used by several other groups that have claimed the name "Irish Republican Army" since 1922, and that have variously refused to recognise the legitimacy of the Irish Defence Forces, Northern Ireland and the Republic of Ireland.
Split into simpler sentences: The name has also been used by several other groups that have claimed the name "Irish Republican Army" since 1922. Such groups have variously refused to recognise the legitimacy of the Irish Defence Forces, Northern Ireland and the Republic of Ireland.