"Simple means getting rid of extra words. Don't write, 'He was very happy' when you can write 'He was happy.' You think the word 'very' adds something. It doesn't."
— Scott Adams
Entire stories can be told with fewer words. It is rumored that Earnest Hemingway once wrote a short story with just six carefully chosen words: "For sale: baby shoes, never worn." Even though there are not many words, the heartache is still evident.
Try writing a story in as few words as possible, as though you were writing a tweet. Then, tell that same story with fifty words. You can try reversing this as well, starting with more words and reducing it to less than ten.