Complex sentence: He reorganised the Cork Irish Volunteers-the paramilitary organisation that became the Irish Republican Army-in 1919, becoming commandant of the Cork No.2 Brigade of the IRA during the guerrilla Anglo-Irish War.
Split into simpler sentences: He reorganised the Cork Irish Volunteers-the paramilitary organisation that became the Irish Republican Army-in 1919. He became Commandant of the Cork No.2 Brigade of the IRA during the guerrilla Anglo-Irish War.