Complex sentence: Shortly after TAS changed its judicial status to S.A. (corporation), the acronym was changed to TASSA and in September 1955 Transportes Aéreos Nacional became the controler of the airline.
Split into simpler sentences: Shortly after TAS changed its judicial status to S.A. (corporation) and the acronym was changed to TASSA. In September 1955 Transportes Aéreos Nacional became the controler of the airline.