Mr. Brooks, a hard-right Republican and a once-fierce ally of Mr. Trump’s whom the former president has accused of becoming “woke,” has drawn intense scrutiny for his actions preceding the violence on Jan. 6. NYT, Abandoned by Trump, Mo Brooks Is Now Open to Testifying About Jan. 6, Jun. 23, 2022
This is an excerpt from an NYT article. I don't figure out the exact meaning of the bolded part. I think it could be simply put as "a once-fierce ally of Mr. Trump, who has accused him of becoming woke." Is there any specific reason to write like this?