The answer is *Which had undergone a complete makeover.* Adjective clauses identify the word it's modifying.
Every itme when I am stuck on the writing topic, I make it up. It is easier to write about the topic you like. Here what I came up with:
I came home from school and found a strange box at my front door…
I got a letter in the mail saying I won round the world ticket!
The other night I dreamt I was a stray dog…
I was riding my bike when all of a sudden…
To travel constantly without a fixed destination; wander
He knew Virgil was a respected writer and hoped people would consider his words wise.
