COMPOUND sentences (two SVO´s joined with a conjuction):
Sally works while David travels. Sally works hard but her boss doesn´t appreciate her.
COMPLEX sentence: one SVO with subordinate clause
Sally works, while eating. Sally works hard and skips her lunch.
Here is an example of a simple sentence (One SVO in the Perfect Continuous tense with a verbal action comprising two verbs; adverb, prepositional phrase, and a tag question at the end)
Sally hadn’t really been needing to work so many days in the office, had she?