Original: The Taoiseach (Oxford English Dictionary; ), plural Taoisigh ( or ), also referred to as An Taoiseach,Retaining the Irish definite article an  instead of English the.
Simplified: The Taoiseach ( in EnglishOxford English Dictionary;  (plural Taoisigh ( or ) in Irish), also referred to as An Taoiseach,Keeping the Irish definite article an  instead of English the.