It's definitely a high band, 6 marks at the very least, what would ensure 8/8 would be to just put a short paragraph explaining a sentence form.
I usually do this by writing "the last lines in the sentence are carefully controlled into a (e.g.) compound-complex sentence... (this has this affect and so and so)"
I personally would give it an 8/8, as the language analysis shown is incredible. Personally, it makes up for the lack of any sentence forms depicted in the answer.
Never mind, detailing sentences is a structural technique, my bad.