Complex sentence: Rosenberg has often collaborated with composer Karin Rehnqvist, and singer Lena Willemark, for example performing "Pucksånger--lockrop" at the ISCM Festival in Stockholm in 1994.
Split into simpler sentences: Rosenberg has often collaborated with composer Karin Rehnqvist, and singer Lena Willemark. The singers performed "Pucksånger--lockrop" at the ISCM Festival in Stockholm in 1994.