The question is incomplete, but i will try my best to assist you in the way i can.
The most effective place to insert the omitted sentence is in the introduction
The given sentence gives an introduction to an essay or article, where the readers are given a glimpse of what is to come by clearly stating what is to be expected in the other parts of the essay.
Therefore, if this sentence was omitted from an article, then the most effective place to insert it, is in the Introduction.
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