Complex sentence: Several world-wide great artists have been visiting Kongsberg during this festival; international stars including Chick Corea, Herbie Hancock, John Scofield and Pat Metheney have played in Kongsberg.
Split into simpler sentences: Several world-wide great artists have been visiting Kongsberg during this festival. International stars including Chick Corea, Herbie Hancock, John Scofield and Pat Metheney have played in Kongsberg.