Complex sentence: He participates/has participated in the music groups "Fabulous Four" and "Idolerna" and as solo singer he has had great prosperities with hits as "Anna och mej" and "Dagny".
Split into simpler sentences: He participates/has participated in the music groups "Fabulous Four" and "Idolerna". He has also had great prosperities as solo singer, with hits as "Anna och mej" and "Dagny".