Complex sentence: Jonas Berggren, a.k.a. Joker, (born Jonas Petter Berggren, 21 March 1967, in Göteborg, Sweden) started writing songs when he was seven, and continues to write for the Swedish band Ace of Base, as well as other bands.
Split into simpler sentences: Jonas Berggren, a.k.a. Joker (born Jonas Petter Berggren, 21 March 1967, in Göteborg, Sweden), is a Swedish musician. He started writing songs when he was seven, and continues to write for the Swedish band Ace of Base, as well as other bands.