Complex sentence: In the September 2012 election his government lost the general election and the Parti Québécois became the new government, following this he lost his own seat and with this outcome announced September 5 that will be resigning as Quebec Liberal Leader.
Split into simpler sentences: In the September 2012 election his government lost the general election and the Parti Québécois became the new government. He lost his own seat and with this outcome announced September 5 that would resign as Quebec Liberal Leader.