Complex sentence: The Oude Maas then heads northwest between the towns/cities of Spijkenisse and Hoogvliet and joins river Nieuwe Maas opposite the city of Vlaardingen, the combined river is known as Het Scheur and flows to the North Sea.
Split into simpler sentences: The Oude Maas then heads northwest between the towns/cities of Spijkenisse and Hoogvliet and joins the river Nieuwe Maas opposite the city of Vlaardingen. The combined river is known as Het Scheur and flows to the North Sea.