Complex sentence: The Rennsteig (sometimes called Rennweg), an ancient path following its summits along the main ridge, now a famous hiking path, marks the traditional boundary between northern and central Germany, the boundary between Thuringia and Franconia.
Split into simpler sentences: The Rennsteig (sometimes called Rennweg) is an ancient path following its summits along the main ridge. It is now a famous hiking path and it marks the traditional boundary between northern and central Germany, the boundary between Thuringia and Franconia.