Start with a quality article. This means a unique topic or viewpoint on a very specific topic. The information must be valuable to a human reader. At this point in time, it is not possible for any software program to produce content that is engaging. If you start out with a low-quality article, the chances are high that the alternate versions are going to be even worse.
I've ranked websites in the past with spun content, and now they are still on #1 position of google. First year (2014) google found me because my spun was really bad, many paragraphs were just copied and my position drop from #2 to around #20 after a panda update. Later I cleaned all my text with better spun (I didn't buy any article!), my ranking went up again, and with more backlinks I reached #1 and it is still there