Original: When the borders of the state were fixed in 1922 after several regional conflicts, the Republic bordered Czechoslovakia, Germany, Free City of Danzig, Lithuania, Latvia, Romania, and the Soviet Union, plus a tiny strip of the coastline of the Baltic Sea, around the city of Gdynia.
Simplified: When its borders were fixed in 1922 after several wars, it had borders with Czechoslovakia, Weimar Republic, Free City of Danzig, Latvia, Lithuania, Romania and Soviet Union.