Sentence:  Literary Bengali of prose, during the greater part of the 19th century, was thus a doubly artificial language ; and, with its forms belonging to Middle Bengali, and its vocabulary highly <WSD>Sanskritised</WSD>, it could only be compared to a ‘ Modern English ' with a Chaucerian grammar and a super-Johnsonian vocabulary, if such a thing could be conceived. 
Meaning of the word marked with <WSD> tags:  To influence a non-Sanskrit language by Sanskritic vocabulary.