One maxim that my students find helpful is: One thought per sentence. Readers only process one thought at a time. So give them time to digest the first set of facts you want them to know. Then give them the next piece of information they need to know, which further explains the first fact. Be grateful for the period. Writing is so hard that all us, once launched, tend to ramble. Instead of a period we use a comma, followed by a transitional word (and, while), and soon we have strayed into a wilderness that seems to have no road back out. Let the humble period be your savior. There’s no sentence too short to be acceptable in the eyes of God.