Original sentence: Some of the major subgroups of Serbs include: Šumadinci, Ere, Vojvođani, Bačvani, Banaćani, Sremci, Semberci, Krajišnici, Hercegovci, Torlaks, Shopi,etc
Edited sentence: In the late 20th century, a independence movement in Montenegro gained ground, resulting in a split among Montenegrins on the issue.Montenegrins were/are considered a subgroup of Serbs for a long time by themselves, as well as by Serbs outside Montenegro.Now some consider themselves to belong to a separate Montenegrin nation.Some of the major subgroups of Serbs include: Šumadinci, Ere, Vojvođani, Bačvani, Banaćani, Sremci, Bokelji, Semberci, Krajišnici, Hercegovci, Torlaks, Shopi,etc