The objective here is to carefully breakdown each side of the debate on the topic. Rhetorically, introduce one side of the debate, and show how the text you have selected reveals this claim. This should be followed by the assertions supporting the opposing side. You may choose to make a few claims supporting one side, followed by those claims supporting the other. Or, you may choose to intertwine the opposing claims, paragraph by paragraph. Whichever argumentative approach you choose should represent what, you believe, will most intelligently and objectively present both sides charitably.
The goal of this form of argumentative, analytic approach is to explain the crux of an issue—to present the claims that most suggestively oppose each other on a specific issue.