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A famous Russian orientalist P.Melioransky regards the manuscript's date as 16th – early 17th centuries.
Is this sentence grammatically correct? Thanks.
(Not a teacher) In terms of prescriptive grammar, I would say,
A famous Russian orientalist P.Melioransky regards the date of the manuscript as 16th – early 17th centuries.
Except this, it is absolutely grammatical correct.
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