Complex sentence: In 2015, this effort was joined by the "Rabid Puppies" campaign, led by Vox Day; the two combined slates had a profound impact on the nominations, resulting in the nomination of primarily white, male authors.
Split into simpler sentences: In 2015, this effort was joined by the "Rabid Puppies" campaign, led by Vox Day. The two slates dominated the nominations, resulting in a slate of primarily white, male authors.