I read a sentence like this" the driver will also be adjusting his behavior in response to what he perceives are changes in risks." Doe it mean "the driver will be adjusting his behavior according to the variation of risk changes in his eyes"? And does " what " both introduces an objective clause after " of" and a subjective clause in the "what he perceives are changes in risks'?
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The driver will also be adjusting his behaviour in response to what he perceives are changes in risks . "
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The driver will also be adjusting his behaviour in response to what he perceives are changes in risks.
I would analyse the underlined element as a subordinate interrogative clause (embedded question) where the meaning is:
"The driver will also be adjusting his behaviour in response to the answer to the question 'What does he perceive are changes in risks?'"