Complex sentence: Pavlović started playing professionally for Freiburg II and spent his early career playing in lower league teams, like Schaffhausen and Kaiserslautern, up until 2010, when he signed for Grasshopper.
Split into simpler sentences: Pavlović started playing professionally for SC Freiburg II and spent his early career playing in lower league teams, like FC Schaffhausen and 1. FC Kaiserslautern, up until 2010, when he signed for Grasshopper.