Complex sentence: The club's most significant achievements to date are winning four consecutive Canadian Championships from 2009 to 2012 reaching the semifinals of the 2011--12 CONCACAF Champions League, and in 2015, qualifying for the MLS Cup Playoffs for the first time in franchise history.
Split into simpler sentences: The club's most significant achievements to date are winning four consecutive Canadian Championships from 2009 to 2012, and reaching the semifinals of the 2011--12 CONCACAF Champions League. In 2015, Toronto qualified for the MLS Cup Playoffs for the first time in franchise history.