Complex sentence: After two seasons at FC Bayern, he returned to Kaiserslautern in 2002, joining Kaiserslautern for a third time, Sforza's "double return" is unique in the German Bundesliga.
Split into simpler sentences: After two seasons at FC Bayern, he returned to Kaiserslautern in 2002. Joining Kaiserslautern for a third time, Sforza's "double return" is unique in the German Bundesliga.