Complex sentence: Piecki-Migowo together are popularly called The Morena and are located on the top of the hill over 100 meters above sea level, that used to be an example of Arcadian nature.
Split into simpler sentences: Piecki-Migowo together are popularly called The Morena. It is located on top of a hill more than 100 meters above sea level that used to be an example of Arcadian nature.