Complex sentence: The Alberta New Democratic Party was elected to a majority under new leader Rachel Notley, forming government for the first time in its history and ousting the Progressive Conservatives, who were reduced to third place.
Split into simpler sentences: The Alberta New Democratic Party (NDP) was elected to a majority government under new leader Rachel Notley. The NDP formed the government for the first time in its history and ousted the Progressive Conservatives, who were reduced to third place.