Complex sentence: The original use of the term'Volunteer' in this context dates back to the 18th centry Irish Volunteers, an almost exclusively Protestant militia corps raised in 1778 to augment the army and to defend Ireland from foreign invasion.
Split into simpler sentences: The original use of the term'Volunteer' in this context dates back to the 18th centry Irish Volunteers. An almost exclusively Protestant militia corps raised in 1778 to augment the army and to defend Ireland from foreign invasion.