Which is a complex sentence?
A: Akira and her sisters drew a map of the United States and hung it on the wall.
B: Joe walked through Paris in a daze because he was still suffering from jet lag.
The first sentence is the complex sentence. It is made up of an independent clause and a dependent clause. The dependent clause begins with the subordinating conjunction because.
Joe walked through Paris in a daze because he was still suffering from jet lag.