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What is the correct way to punctuate the following sentence? Explain your answer.
Since Tris is divergent she has a difficult decision to make about which faction to join and she agonizes over the decision.
Since Tris is divergent, she has a difficult decision to make about which faction to join, and she agonizes over the decision.
A dependent clause followed by an independent clause requires a comma; two independent clauses joined by a coordinating conjunction need a comma before the conjunction.