Complex sentence: In the Republic of Ireland townlands continued to be used on addresses, but in 2005 the Department of Communications, Energy and Natural Resources announced that the postcode system was to be introduced (see Republic of Ireland postal addresses).
Split into simpler sentences: In the Republic of Ireland, townlands continued to be used on addresses. However, in 2005 the Department of Communications, Energy and Natural Resources announced that the postcode system is to be introduced (see Republic of Ireland postal addresses).