Complex sentence: ENTel was privatised by being split into two companies: "Sociedad Licenciataria Norte S.A." and "Sociedad Licenciataria Sur S.A.", today known as Telecom Argentina and Telefónica de Argentina, respectively.
Split into simpler sentences: ENTel was privatised by being split into two companies: "Sociedad Licenciataria Norte S.A." and "Sociedad Licenciataria Sur S.A.". Upon their transfer, these entities became known as Telecom Argentina and Telefónica de Argentina, respectively.