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It's not a run-on, which by definition has two or more independent clauses in the same sentence that are not separated by either (1) punctuation such as a semicolon, colon, or em dash, or (2) a comma plus a coordinating conjunction. The first clause is independent (i.e. it can stand alone as a complete sentence), while the second clause is relative.

Ditto here. Mostly children’s books.

Teaching isn’t about managing behavior, but it is about managing attention. A misbehaving student draws others’ attention from the task at hand, stealing valuable focus away from the learning activity. Managing behavior is therefore critical to both teaching and learning.