Complex sentence: Being dedicated to the aviation industry means that SITA needs to be present in all countries where the aviation industry operates, and today operates in over 200 countries and territories, employing people of more than 140 nationalities, speaking over 70 different languages.
Split into simpler sentences: Being dedicated to the air transport industry means that SITA needs to be present in all countries where the industry itself operates. Today SITA operates in over 200 countries and territories, employing people of more than 140 nationalities, speaking over 70 different languages.