Complex sentence: Erymanthos is surrounded by Mount Skollis to the west and in the middle a valley filled with farmlands, Panachaiko and Omplos to the north along with other, several smaller mountains to the east and further east Chelmos which can be seen and more to the south.
Split into simpler sentences: Erymanthos is surrounded by Mount Skollis to the west; in the middle is a valley filled with farmlands, Panachaiko and Omplos. To the north are several smaller mountains, and also to the east and further east Chelmos, which can be seen and more to the south.