Complex sentence: Radomka is a river in central Poland, a left tributary of the Pilica river, with a lenght of 98 km and the basin area of over 2000 sq. km (all in Poland).
Split into simpler sentences: Radomka is a river in central Poland, and it is a left tributary of the Pilica river. It has a length of 98 km and a basin area of over 2000 sq. km (all in Poland).