Original sentence: In addition to its frontier with Central Serbia, Kosovo borders Montenegro, Albania, and the Republic of Macedonia.It has a population of just over two million, predominantly ethnic Albanians, with smaller populations of  Serbs, Turks, Romani people, Goranis, Bosniaks, and other ethnic communities
Edited sentence: In addition to its frontier with the remainder of Serbia, Kosovo borders Montenegro, Albania, and the Republic of Macedonia.It has a population of just over two million people, predominantly ethnic Albanians, with smaller populations of  Serbs, Turks, Romani people, Goranis, Bosniaks, and other ethnic communities