Complex sentence: Today, the Rhine Graben forms a basin through which the Rhine River flows and is bounded to the west by the Vosges mountain range, in France, and to the east by the Black Forest in western Germany.
Split into simpler sentences: Today, the Rhine Graben forms a basin through which the Rhine River flows. It is bounded to the west by the Vosges mountain range in France, and to the east by the Black Forest in western Germany.