Complex sentence: Drwęca is a river in northern Poland, a tributary of the Vistula river (near Torun), with a length of 207 kilometres (17th longest) and the basin area of 5,344 sq. km. (all in Poland).
Split into simpler sentences: Drwęca is a river in northern Poland and a tributary of the Vistula river (near Toruń). It has a length of 207 km (17th longest) and a basin area of 5,344 km² (all in Poland).