Complex sentence: Ukraine is divided almost in half by the Dnipro river, which traverses Ukraine north to south, joining the Black Sea west of the Crimea, near the mouths of the Bug and the Dnister rivers.
Split into simpler sentences: Ukraine is divided almost in half by the Dnipro river, which traverses Ukraine north to south. It is joined by the Black Sea, which is west of the Crimea and near the mouths of the Bug and the Dnister rivers.