Complex sentence: The western parts of Srem/Srijem are in easternmost Croatia, but the border between the region and Slavonia to the west is unclear, and runs somewhere along the line Vukovar-Vinkovci-Županja.
Split into simpler sentences: The western parts of Srem/Srijem are in easternmost Croatia, though the border between this region and Slavonia to the west is unclear. It runs somewhere along the line Vukovar-Vinkovci-Županja.