Content needs to be written differently when you primary delivery is on smart phones or tablets. Shorter sentence structure and reduced word count, as well as principles from SEO are recommended.
Unfortunately, most of us don't write this way; we write until we fill up a laptop or computer screen. Also, our eyes can "remember" more on a sheet of paper or large screen than we can in transient "thumb fuls" of smart phone paragraphs.
Try the exercises developed by Maxwell Hoffmann of Adobe, and you will be surprised at how easy it is to "think different / write diffe