Complex sentence: Folli Follie Group has a very strong presence in the travel retail market in Greece (via the Hellenic Duty Free Shops) and abroad, with points of sale in numerous duty free shops in airports around the world as well as in flight in major international airlines.
Split into simpler sentences: Folli Follie Group has a strong presence in the Greek travel retail market in through the Hellenic Duty Free Shops. It has several points of sale in duty free shops in airports around the world as well as in-flight in major international airlines.