Which as a connector

[Jov]

Hi Team,

I was taught the usage of that/Which in the following way:

That

1) I suggest that you write the book.
(s) (v)
Connector - If subject and verb are coming after that

2)The book that is kept aside mine.
(v)
Modifier - if only verb comes after that (Describing information)

Which

Can't be connector, always modifier.
Which + verb

Now I have found sentence in OG13 Q.No.104 that says " In her book illustrations, which she carefully coordinated with her narratives"

Please explain in detail if we can use which as a connector or What would be the right way to use them in this context?

Thanks in advance.

[RonPurewal]

Still a modifier. Basically, "which" can be either the subject or the object of a verb.

"Which" as subject:
The longest highway in the United States is Interstate 90, which extends from Seattle to Boston.
These principles are written in the revised honor code, which was published last week.

"Which" as object:
This piece is Beethoven's Ninth Symphony, which he wrote shortly before his death.