Complex sentence: It is conversely viewed as a variant of rockism sometimes motivated by commercial or social interests, in other words, a bias which privileges only the best-selling or widely-covered pop, hip-hop, and R&B acts.
Split into simpler sentences: It is conversely viewed as a variant of rockism sometimes motivated by commercial or social interests. In other words, a bias that privileges the most famous or best-selling pop, hip-hop, and R&B acts.