Is there a comma splice in this sentence?

Additionally, the tone of the second passage is extremely subjective and informal, for the writer communicates the biased views of the swamp, evident through the use of powerful and personal adjectives such as, "archetypal, the swamp of legend, of racial memory, of Hollywood" and "hellish zoo" to describe the wild existence of the swamp.

It's a very long and involved sentence, but I don't see any comma splice. I'll reread it to make sure ...

Nope -- no comma splice.

Additionally, the tone of the second passage is extremely subjective and informal,<~~first independent clause for the writer communicates the biased views of the swamp,<~~second independent clause joined to the first with "for" evident through the use of powerful and personal adjectives<~~adjective phrase modifying "biased views" such as, "archetypal, the swamp of legend, of racial memory, of Hollywood" and "hellish zoo" to describe the wild existence of the swamp.<~~examples to clarify "adjectives"

Yes? No?

Thanks. I agree with you.

The teacher who graded this AP English paper corrected the paper by inserting
; (semi-colon) instead of a comma after informal and got rid of "for."

I've advised the student to try to use shorter sentences to avoid this kind of problem. :-)

And this is the same teacher who was foisting her view of that passage on the student's writing, correct?

Hmmm!

Yep! :-(