Complex sentence: Literarily, the deuteragonist often assumes the role of "sidekick" to the protagonist; an example being Ronald Weasley in the Harry Potter series, while Hermione Granger is the tritagonist.
Split into simpler sentences: Literarily, the deuteragonist often assumes the role of "sidekick" to the protagonist. Such as Ronald Weasley in the Harry Potter series, while Hermione Granger is the tritagonist.