Complex sentence: Emanuel was elected Mayor on February 22,2011 with 55% of the vote and was sworn in as the 55th Mayor of Chicago on May 16,2011 at the Pritzker Pavilion.
Split into simpler sentences: Emanuel was elected Mayor on February 22,2011. Emanuel won election on February 22,2011 with 55% of the vote and was sworn in as the 55th Mayor of Chicago on May 16,2011 at the Pritzker Pavilion.