Pregabalin works by changing the way that nerves send messages
to your brain. If the messages are reduced, then the pain will be
reduced.
http://www.wales.nhs.uk/sitesplus/documents/863/Pregabalin%20Information.pdf
please explain the grammatical form and function of "that" here?
is "that nerves sending messages to your brain" a noun clause functioning adjectivally and modifying the noun "way"?
It is both a relative pronoun and a subordinating conjunction. "
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It is both a relative pronoun and a subordinating conjunction. It introduces a relative clause, post-modifying "way."