Which is a complex sentence?

 - The package includes some old letters from my grandma to my dad and a broken pocket watch.
 - After Patty returned from the Galápagos Islands, she showed Scott and Norma pictures of all the exotic animals.
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 after.
After Patty returned from the Galápagos Islands, she showed Scott and Norma pictures of all the exotic animals.