Complex sentence: Wiki-PR is a public relations firm that markets its ability to edit Wikipedia, though their practices have contradicted Wikipedia practices including those on sockpuppetry and conflict-of-interest editing, leading to hundreds of blocked accounts.
Split into simpler sentences: Wiki-PR is a public relations firm that markets its ability to edit Wikipedia. Its practices have contradicted Wikipedia practices, including those on sockpuppetry and conflict-of-interest editing, leading to hundreds of blocked accounts.