Complex sentence: A period of diplomatic acrimony closed with the Treaty of Rome (27 January 1924), signed by Italy and Yugoslavia but unrecognized by all other powers, which assigned Rijeka to Italy and Sušak (Porto Barros) to Yugoslavia, with joint port administration.
Split into simpler sentences: A period of diplomatic acrimony closed with the Treaty of Rome (27 January 1924), signed by Italy and Yugoslavia but unrecognized by all other powers. This agreement assigned Rijeka to Italy and Sušak (Porto Barros) to Yugoslavia, with joint port administration.