Complex sentence: NUTS 1 level places the entire country in a single unit, while there area three NUTS 2 regions; these are Central and Eastern (Pannonian) Croatia, Northwest Croatia and Adriatic Croatia.
Split into simpler sentences: NUTS 1 level places the entire country in a single unit, while there area three NUTS 2 regions. Those are Northwest Croatia, Central and Eastern (Pannonian) Croatia and Adriatic Croatia.