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.
Storms in late fall rejuvenate some of the waterfalls and all of them accumulate frost along their edges many nights during the winter. This is not a complete list of Yosemite's waterfalls. While all but the last two of the waterfalls listed below are in Yosemite Valley, both Yosemite Valley and many other areas of the park have waterfalls both big and small. Yosemite Falls (2,425 ft) Flows: approximately November through July, with peak flow in May.