Complex sentence: The height of the east stand is very low which is another design goal imposed by the High Council to not ruin the Bosphorus area, since the east-stands are just 100 meters away from the sea.
Split into simpler sentences: The height of the east stand is very low which is another design goal imposed by the High Council to not ruin the Bosphorus area. Since the east-stands are just 100 meters away from the sea.