Is any person who promotes a change in society

This could be many things depending on the context.

Explanation:

Humanitarian: A person who promoted social welfare and social reforms.

Advocate: A person who speaks or writes in support of a cause, person, etc.

hope this helps!! if not, please give us more context.

Explanation:

feminist: someone to advocates for women's rights.

activist: someone with a certain cause they fight for. they host protests, speak at events, and raise money and awareness on behalf of their cause.  

the sentence does not violate the phrase structure second rule (introduced by noam chomsky) because noun phrases consist of a determiner such as a, the or every, and a noun. in the sentence, the noun phrase the cake includes a determiner (the) and a noun (cake).

on the other hand, the first rule indicates that a sentence encloses a noun phrase, followed by a verb phrase. the example sentence can be analysed as follows:

john (n) + ate (v) + the (det) + cake (n).

c, have a good day ~matya