Add a non-breaking space ( ) between the last two words of every paragraph, between words you don’t want to break apart, or a non-breaking hyphen (​) as the hyphen in hyphenated words. This will keep your live text from leaving an orphan/widow hanging out alone (and sad).
Note: Do not use padding, or a tight space to try to fix this for live text. Doing so can cause undesirable effects across email clients.
I am a sentence that might break apart if nobody fixes me. I am a sentence that might need a non​breaking hyphen.