A complex sentence is a sentence consisting of an independent clause and a subordinating clause. Or, to put it more simply, complex sentences involve more than just a straightforward noun + verb. Complex sentences include extra phrases added to a base sentence, but which cannot stand alone as a sentence. For example:
Published 4:00 am, Thursday, January 9, 1997. 1997-01-09 04:00:00 PDT Yosemite National Park -- Yosemite Valley is slowly drying out after what park rangers are calling the worst flood here in recorded history, leaving behind hundreds of upturned tent-cabins and acres of wrecked camping sites.
Other Yosemite lodging includes Cedar Lodge which offers private beach access on the Merced River, Curry Village where visitors have the option of sleeping in a tent cabin, and Yosemite Lodge at the Falls, a rustic lodge just a short walk away from the Yosemite Falls.