Complex sentence: The Vienna Woods may be defined as that group of hills bounded by the rivers Triesting, Gölsen, Traisen and Danube, and is a favourite outdoor destination for the densely-populated area around Vienna.
Split into simpler sentences: The Vienna Woods may be defined as that group of hills bounded by the rivers Triesting, Gölsen, Traisen and Danube. It is a favourite outdoor destination for the densely-populated area around Vienna.