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.
Public Showers at Camp Curry; dirty Upper Pines toilets. Public Showers at Camp Curry; dirty Upper Pines toilets. Our campsite at Yosemite was great and the park was spectacular, although I was stunned by the campsiteâs appalling toilet facilities, which would have been better located in a 3rd world country. There were also no showering facilities.