Complex sentence: It lies between the larger cities of Gdańsk (Danzig) (to the south-east) and Gdynia (to the north), the three towns together making up the metropolitan agglomeration called "Trójmiasto" (Tri-City).
Split into simpler sentences: It lies between the larger cities of Gdańsk (Danzig) to the southeast and Gdynia to the northwest. The three cities together make up the metropolitan agglomeration of the "Trójmiasto" (Tri-City).