You are on a hike alone deep in the woods. You come upon a clearing where a man in an immaculate tuxedo is standing alone.
The comma splice is no surprise (They’re everywhere — run for your lives! 🙂 ), but the article glitch is another matter. Unless the person who created the original writing prompt I’m using for this example thought the article a belonged with suit and chose to ignore immaculate before it, I have no idea what could have been the reasoning for not using an instead.
In case you didn’t lean this rule in elementary school (or if English isn’t your first language), here’s a reminder: use a after words that begin with a pronounced consonant and an with words that begin with a pronounced vowel. You don’t say an unicorn because the u is pronounced like the consonant y, but you do say an umbrella, because there the u is pronounced as a vowel. Immaculate begins with a vowel, so an is the correct indefinite article. (Now you see why I prefer to keep these explanations as jargon-free as possible?)