Complex sentence: The 2014 Portuguese Socialist Party prime ministerial primary was held on 28 September 2014 and wias the first open primary in the history of the party, and of Portugal, and elected the party's candidate for Prime Minister for the 2015 general election.
Split into simpler sentences: The 2014 Portuguese Socialist Party prime ministerial primary was held on 28 September 2014. It was the first open primary in the history of the party, and of Portugal, and elected the party's candidate for Prime Minister for the 2015 general election.