Complex sentence: From the early 1960s, Up until 2009 it served as one of the three air transportation hubs (the other two hubs being Praia and Amilcar Cabral International airports) in Cape Verde, though it only based domestic flights up until then (2009).
Split into simpler sentences: From the early 1960s, Up until 2009 it served as one of the three air transportation hubs (the other two hubs being Praia and Amilcar Cabral International airports) in Cape Verde. Though it only based domestic flights up until then (2009).