Complex sentence: Due to the common interests and shared religious heritage of both countries, Greece and Russia enjoy excellent relations which is reflected by the fact that both states are co-operating in several fields, and especially in trade, culture, energy, military and tourism.
Split into simpler sentences: Due to the common interests and shared religious heritage of both countries, Greece and Russia enjoy excellent relations. Both states are co-operating in several fields, and especially trade, culture, energy, military and tourism.