According to Copyblogger, 80% of people read a headline but only 20% read the body. People don't read pages anymore. They scan, skim, and dive into whatever catches their eye.
Which means a wall of dense text isn't thorough. It's invisible. If your sales page or email is one solid block, most people bounce off it without absorbing a thing.
Make your copy scannable: short paragraphs, subheads that tell the story on their own, bold on the lines that matter, white space that lets the eye rest.
Four free tools that score how readable your copy is, so you're not guessing: the Readability Test Tool, Edit Central, Online-Utility, and the Hemingway App. Hemingway in particular flags every sentence that's too long or too dense.
Paste your main sales page into one of them. If it scores at a college reading level, you're losing the skimmers, which is almost everyone.