Complex sentence: In December 2002 Sissel was again invited to represent Norway at the Nobel Peace Prize Concert, for which she sang "Somewhere over the Rainbow" from "The Wizard of Oz" and "The Prayer" in a duet with Josh Groban.
Split into simpler sentences: In December 2002 Sissel was again invited to represent Norway at the Nobel Peace Prize Concert. Here she sang "Somewhere over the Rainbow" from "The Wizard of Oz", and a duet of "The Prayer" with Josh Groban.