Yes, that is a complete sentence because it has a subject (he) and a verb (refused), although it does need a period after 'refused'. That's all you need to form a sentence.
The indefinite pronoun in the sentence is anyone.
This sentence is grammatically correct.
The new sneakers I wanted to by were marred so I refused to pay full price for them.
The dissentient soldier refused to shoot his weapon at the civilians.
The child was acting insolently when he refused to heed his mother's many warnings about not picking up his toys.
The sentence: He refused. Extended: He refused to do it. Or: He refused to do it even though he knew how much it meant to me.
I Refused to open the door.
He refused to go to San Diego
Example sentence - He refused to give his teen children punishments or consequences for their improper behavior, which led to the end of his marriage.
Example sentence - She refused to be abused by him and chose to terminate their relationship.
He obstinately refused to hear my reasons.
The boy refused stubbornly to get married.
firmly
The criminal refused to cooperate with the police
He refused to consummate his arranged marriage on the grounds that he was a homosexual.
Jasmine, refused to hearken the teachers words.
the little boy defiantly refused to a obey his father