Complex sentence: They performed on a few Rock happenings and Bedem Fest in Niksic 2012 and ARTist Fest in Kotor 2014 in Montenegro but the work was slowed due to health issues in the families of the band members.
Split into simpler sentences: They performed on a few Rock happenings as Bedem Fest in Niksic 2012 and ARTist Fest in Kotor 2014 in Montenegro. Their work was slowed due to health issues in the families of the band members.