Complex sentence: Orne is in the current region of Basse-Normandie and is surrounded by the departments of Eure, Eure-et-Loir, Sarthe, Mayenne, and Calvados; it is the only department of Basse Normandie and Haute Normandie to be landlocked.
Split into simpler sentences: Orne is in the current region of Basse-Normandie and is surrounded by the departments of Eure, Eure-et-Loir, Sarthe, Mayenne, and Calvados. It is the only department of Basse Normandie and Haute Normandie to be landlocked.