Complex sentence: Born in Nijmegen, Janssen made his professional debut for VVV-Venlo in the 2004-05 season, before signed for Roda JC in 2007.
Split into simpler sentences: Born in Nijmegen, Janssen made his professional debut for VVV-Venlo in the 2004-05 season. He signed for Roda JC in 2007.