Complex sentence: Despite a strong finish to the season with only 2 losses in their last 12 games, TFC missed the MLS playoffs for a fifth straight year but advanced to the 2011--12 CONCACAF Champions League semifinals, the first Canadian team to do so.
Split into simpler sentences: Despite a strong finish to the season with only 2 losses in their last 12 games, TFC missed the MLS playoffs for the fifth straight year. TFC did however advance to the 2011--12 CONCACAF Champions League semifinals, becoming the first Canadian team to do so.