Why does Bilger spend so much time describing Aronson? what is Bilger's purpose? ( the last meow)

In The Last Meow, Bilger's purpose is to describe how practices in veterinary have changed in recent years, and how this change has affected practitioners. One of these practitioners is Dr. Aronson. Aronson is a thirty-six year old vet who has specialized in kidney transplants. The purpose of spending so much time describing this vet is that he serves as an example of the type of work doctors deal with nowadays in veterinary practices.

faulty parallelism is a grammar construction where there is no balance in the parts of a sentence they have a similar meaning but the grammar structure is not equivalent.

the correct version of this faulty parallelism in the sentence is:

jefferson wrote the declaration of independence, and he was the nation's third president.

the problem with the first version is that the sentence:

"jefferson was both the writer of the declaration of independence"

presents jefferson as both a subject and an agent for the verb "write" because if he was "the writer" then the declaration of independence was written by him, besides that fact, the sentence presents a dependent clause.

while the second sentence:

he was the nation's third president.

presents a basic subject+verb+object structure

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in both sentences:

jefferson wrote the declaration of independence, and he was the nation third president.