Complex sentence: As an infant, he moved with his parents to Upplands Väsby (a Stockholm's suburb) in Sweden, where he started/developed his musical career, where he grew up, and has spent most of his life.
Split into simpler sentences: As an infant, he moved with his parents to Upplands Väsby (a Stockholm's suburb) in Sweden, where he started and developed his musical career. This is also where he grew up, and has spent most of his life.