Be aware that a person who went through grade 9, for instance, may not read at grade 9 level. Many persons with limited education do not recognize words in writing that they recognize when spoken. I find it easiest to concentrate on content when I write a first draft. Then I revise to lowering the reading level. Using short paragraphs also helps to reduce the reading.
Short paragraphs make the page more inviting to read, as well.
These make the page more inviting to read. Imagine how boring this information would look without the subheads. Subheads let the reader scan for the most relevant information rather than give up reading before finding the parts that apply to him or her. Bulleted points can also help break up material that contains lists. Illustrations do more than improve the appearance.