In Beijing, China, eight luxury residential towers that were designed by Steven Holl Architects are connected on the twelfth through eighteenth floors by enclosed glass and steel bridges.

This sentence is a complex sentence.

Explanation:

A complex sentence is a sentence that contains an independent clause and one or more dependent clauses. An independent clause can stand alone as a sentence, but a dependent clause even though it has a subject and a verb cannot stand alone.

The sentence contain one independent clause and one dependent clause,

the independent clause is in bold below;

eight luxury residential towers that were designed by Steven Holl Architects are connected on the twelfth through eighteenth floors by enclosed glass and steel bridges.

it has a subject and a verb.

While the dependent clause is in bold below;

In Beijing, China,

it does not make any sense on it own.

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.

king hrothgar despair over the inability to defeat grendel