Learn to alert the reader as soon as possible to any change in mood from the previous sentence. At least a dozen words will do this job for you: “but,” “yet,” “however,” “nevertheless,” “still,” “instead,” “thus,” “therefore,” “meanwhile,” “now,” “later,” “today,” “subsequently” and several more. I can’t overstate how much easier it is for readers to process a sentence if you start with “but” when you’re shifting direction. Or, conversely, how much harder it is if they must wait until the end to realize that you have shifted.
