A complex sentence is a sentence that consists of two or more single sentences that are related in structure and not structurally contained in each other. According to the above definition, which of the following are complex sentences? ["The final result proves that you can't rely on ingenuity alone, and you need to work hard to succeed.", 'The mountains are verdant, and the sunset is the most beautiful scenery here.', 'Xiao Zhang was originally a worker. He engaged in technical development and was instructed by the master.', 'Young pioneers in the woods are gathering mushrooms separately.']