thfihe Is this inversion possible? No. This sentence is jumbled.
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thfiheIs this inversion possible?No.
thfiheFor the purpose of expressing the thief's leaving is before "yesterday", is my original sentence appropriate or not?Yes, but it would be more natural with 'yesterday' at the end of the sentence, in my opinion.
thfiheDoes it need a comma between "arrived" and "yesterday"?No.
thfiheThe thief had left when the police arrived yesterday.If the time the thief left was before the the time when police arrived, then you need this: