Answer:
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.
