Complex sentence: Vukovar-Srijem county- "Vukovarsko-srijemska županija" is the easternmost Croatian county which includes southeastern parts of Slavonia, western parts of Srijem, and the lower Sava river basin ("Posavina").
Split into simpler sentences: Vukovar-Srijem county- "Vukovarsko-srijemska županija" is the easternmost Croatian county. It includes the southeastern parts of Slavonia, western parts of Srijem, and the lower Sava river basin ("Posavina").