How can a reader use his or her understanding of theme or central idea to summarize a text objectively?

Students must understand that there is no single theme to any piece of literature.  The more complex the literature, the more possible themes there are. Authors will help students read between the lines for the theme, either through motifs or dominant ideas that are repeated throughout the story. You have to understand the basics of the characterization, plot and other literary elements that are included in the story that you are reading.  

Explanation:

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the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.