Complex sentence: Ordnance Survey Ireland (OSi; Irish: Suirbhéireacht Ordanáis Éireann) is the mapping agency in the Republic of Ireland and together with the Ordnance Survey of Northern Ireland, succeeded, post- 1922, the Irish operations of the United Kingdom Ordnance Survey.
Split into simpler sentences: Ordnance Survey Ireland (OSi; Irish: Suirbhéireacht Ordanáis Éireann) is the mapping agency in the Republic of Ireland. Together with the Ordnance Survey of Northern Ireland, it is the post- 1922 successor to the Irish division of the United Kingdom Ordnance Survey.