Dear tutors, I'm confused about the parallelism of relative clauses/ subordinators:
In chapter [Parallelism] of MGMAT SC, a sample sentence is given:
"There are many people who speak English but whose parents do not."
and the book says: the subordinators do not have to be identical.
However, in chapter [Modifier], there is a sentence:
"Mary buys cookies made with Sugarfree, an artificial sweetener, which tastes as sweet as the corn syrup that her brother loves but where there are fewer calories than in an equivalent amount of corn syrup."
This sentence is incorrect, and the book explains: ...When relative clauses are parallel, they should start with the same relative pronoun.
So i'm confused...Isn't the relative clause a kind of subordinator?
Thanks!!