Complex sentence: The city is surrounded by two hills (Merenta peak 613 m above sea level, and Perati) so it is isolated from the rest of Attica and thus the climate resembles mostly to that of the Aegean Islands with relatively mild winters and hot dry summers.
Split into simpler sentences: The city is surrounded by two hills (Merenta peak 613 m above sea level, and Perati), so it is isolated from the rest of Attica. The climate resembles mostly to that of the Aegean Islands with relatively mild winters and hot dry summers.