Can a quote from a book be more than one sentence long?

Yes, of course a quotation from a book, article or document can be longer than one sentence. After all, sentences vary in length. Please bear in mind that any quotation needs to long enough (and no longer than necessary) to illustrate or support the point you are making. In reports, assignments and so on, quotations of more than (say) two lines should be indented and treated as paragraphs. Obviously, you should not write a report that consists mainly of quotations with the occasional line of commentary.