Complex sentence: SITA has over 550 members and more than 3200 customers, and-uniquely-still solely provides services to the global air transport industry (for airlines, airports, GDSs (Global Distribution Systems) and other aviation companies).
Split into simpler sentences: SITA has over 550 members and more than 3200 customers. Uniquely, the company still solely provides services to the global air transport industry (for airlines, airports, GDSs (Global Distribution Systems) and other aviation companies).