Complex sentence: A study by Nicholson found that contentious statements by party leaders tend to affect polarization of the opposing party more than their own voters, which gives power to party leaders and politicians of high status in their party.
Split into simpler sentences: A study by Nicholson found that contentious statements by party leaders tend to affect polarization of the opposing party more than their own voters. This gives power to party leaders and politicians of high status in their party.