Original sentence: The final unification of the modern day Belarusian lands took place in 1939 when lands occupied by the Second Polish Republic were reunited with Byelorussian Soviet Socialist Republic.Until the end of the 20th century, the lands of modern day Belarus belonged to several countries, including the Principality of Polotsk, the Grand Duchy of Lithuania, the Russian Empire, and the Polish–Lithuanian Commonwealth
Edited sentence: The final unification of Belarusian lands took place in 1939 when lands occupied by the Second Polish Republic were reunited with Byelorussian Soviet Socialist Republic.Until the 20th century, the Belarusians lacked the opportunity to create a distinctive national identity because for centuries the lands of modern-day Belarus belonged to several ethnically different countries, including the Principality of Polotsk, the Grand Duchy of Lithuania, the Russian Empire, and the Polish–Lithuanian Commonwealth