Original sentence: Most of the grain exported was leaving Poland through Gdańsk (Danzig), which because of its location at the terminal point of the Vistula and its tributaries waterway and of its Baltic seaport trade role became the wealthiest, most highly developed (by far the largest center of crafts and manufacturing) and most autonomous of the Polish cities
Edited sentence: Most of the grain exported was leaving Poland through Gdańsk (Danzig), which because of its location at the terminal point of the Vistula and its tributaries waterway and of its Baltic seaport trade role became the wealthiest, most highly developed, and most autonomous of the Polish cities, as well as by far the largest center of crafts and manufacturing