Teachers know the value of repetition. Editors tend to be suspicious of repetition. It takes up space. An editor can recognize the heart of the story and reinforce it in a headline, a drop quote, and a caption. Difficult ideas can be expressed in simple sentences.
Simple sentences are usually short, clear and easy to read.
They contain one clause and one idea. A series of simple sentences also slows the pace for the reader. Each period is a stop sign. The reader has time to digest and assimilate information. Numbers should be handled carefully in a story.