Complex sentence: Tír na nÓg (Old Irish Tír inna n-Óc "--; roughly meaning" Land of Youth) is the most popular of the Otherworlds in Irish mythology.
Split into simpler sentences: Tír na nÓg (Old Irish "Tír inna n-Óc" --) is an Irish language name meaning roughly "Land of Youth". It is the most popular of the Otherworlds in Irish mythology.