Original sentence: However, Poland was not granted the port of Danzig (Gdańsk) and the city was turned into the Free City of Danzig.In 1918 Poland regained independence and based on President Woodrow Wilson's promise to grant Poland access to the sea the newly formed Polish Republic obtained the Polish Corridor and a tiny strip of Baltic Sea coast.Owned by the Żegluga Polska company, she was named after the Olza River which flows through Cieszyn Silesia.SS Olza was the first dry cargo freighter built in Poland after the country regained independence in 1918, and the only large commercial ship built before World War II.Thus, despite retaining some rights and limited sovereignty over the city, Poland had no port of her own - nor any shipyards.To ensure its foreign trade and shipping were independent the port of Gdynia was built, mainly due to the efforts of Eugeniusz Kwiatkowski, along with several shipyards serving both the Polish Navy and the merchant marine.Within a relatively short time of some years Gdynia became a flourishing sea port and a serious competitor to the Free City
Edited sentence: Due to President Wilson's promise to grant Poland access to the sea the newly formed Polish Republic obtained the so-called Polish Corridor and a tiny strip of Baltic Sea coast.However, Poland's ambitions to obtain the formerly German port of Danzig were unsuccessful and Danzig was turned into the Free City of Danzig and thus, despite retaining some sovereignty rights in Danzig Poland had no port of her own - nor any shipyards.Owned by Żegluga Polska company, she was named after the Olza River flowing through Cieszyn Silesia.SS Olza was the first dry cargo freighter built in Poland after the country regained independence - and the only large commercial ship built before World War II.To become independent of Danzig, whose citizens and local government remained hostile against Polish ambitions the port of Gdynia was built, mainly due to the efforts of Eugeniusz Kwiatkowski, along with several shipyards serving both the Polish Navy and the merchant marine.Within a relatively short time of some years Gdynia became a flourishing sea port and a serious competitor to Danzig