Complex sentence: Rousseff and Neves contested the runoff on 26 October with Rousseff being re-elected by a narrow margin,, 51.6% to Neves' 48.4%.
Split into simpler sentences: Rousseff and Neves contested the runoff on 26 October with Rousseff being re-elected by a narrow margin. Rousseff narrowly defeated Neves in the second round, taking 51.6% of the vote to Neves' 48.4%.