Sentence:  In the mean time, the same, or a similar end, may be attained, in the 2d PLACE, By splitting a duty on a commodity, so as to <WSD>unstring</WSD> the stimulus to smuggle, while we preserve the same, or perhaps require a greater amount, from the same subject than we had before. 
Meaning of the word marked with <WSD> tags:  To defuse or relax.