For the 1st sentence, "It is a film with which I laughed much", you could say instead, "The film made me laugh a lot", or "I laughed a lot during the film". I don't usually use the phrase, "with which", otherwise saying, "in which". For using the word "much", "a lot" fits better. Much is better used in a sentence like, "There is much to be done", where it almost is used like a noun. For the 2nd sentence, "It is about a boy who wnats to conquer a girl", I don't know the film you are referring to, and can't critique the content. *wants. For your last sentence, "I recommend that you see it and so you will see lots of landscapes of Spain". I would instead do, "There are many landscapes of Spain in the movie, I recommend that you go see it." Otherwise, you could change yours to two short sentences, "I recommend that you see it. You will see many landscapes of Spain." But in either, "many" fits better than "lots". Did that help?