Complex sentence: This Chamber tomb is a dolmen, the most common form of megalithic structure in Europe, standing at the eastern end of a flat topped, long, wide earthen mound, forming part of a chambered long barrow.
Split into simpler sentences: This chamber tomb is a dolmen, the most common form of megalithic structure in Europe. It stands at the eastern end of a flat topped, long, wide earthen mound, forming part of a chambered long barrow.