Complex sentence: The union with Bavaria was finally dissolved following the reorganisation of German states during the Allied occupation of Germany after World War II. While Bavaria itself was part of the U.S. occupation zone, the Palatinate was occupied by French forces.
Split into simpler sentences: The union with Bavaria was finally dissolved following the reorganisation of German states after World War II during the Allied occupation of Germany. Whereas Bavaria proper was part of the U.S. occupation Zone, the Palatinate was occupied by French Forces.