Complex sentence: At the height of the band's popularity, Kaliopi and Romeo Gril moved to Switzerland and after an extended absence from the music scene, followed by the breakup of Yugoslavia, the band was officially dissolved.
Split into simpler sentences: At the height of the band's popularity, Kaliopi and Romeo Gril moved to Switzerland. After an extended absence from the music scene, followed by the breakup of Yugoslavia, the band was officially dissolved.