Complex sentence: The "Civitas Tungrorum" was a large Roman administrative district corresponding reasonably closely with the modern provinces of Dutch and Belgian Limburg; the Wallonian provinces of Liège, Namur and Luxembourg; and possibly also parts of modern Germany, for example in the Eifel area.
Split into simpler sentences: The "Civitas Tungrorum" was a large Roman administrative district. The region corresponded reasonably closely with the modern provinces of Dutch and Belgian Limburg; the Wallonian provinces of Liège, Namur and Luxembourg; and possibly also parts of modern Germany, for example in the Eifel area.