The robber was long gone prior to the arrival of the police.
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thfiheIs the sentence ambiguous? The robber had left the bank when the police arrived at 4 p.m.No. Not that I see. It's what you paraphrased as (a).
UserTKThe robber was long gone prior to the arrival of the police.He could have left only a minute before. The sentence gives us no idea of the length of time between the departure of the robber and the arrival of the police.