In my 20-plus years as a recruiter, it has been my experience that evaluating sales candidates is the most difficult of any role.
Most roles have a gentle slope of competence, in that accomplishment is difficult, if not impossible to quantify. But sales could not be simpler — how much did you sell compared with how much you were asked to sell that year, i.e., "making quota."
If you make quota, you are a star. If you exceed quota, you are a superstar. If you miss making quota, you are on thin ice, and go downhill from there.
So candidates should do everything they can to make it easier for hiring managers or recruiters to identify their quality. Here are some rules:
Be succinct in what you accomplished. The easiest sales résumé to write is that of a high performer. Don't bury your core accomplishments. I have often seen résumés of high sales performers that detail every responsibility accomplishment and minor change in role. I sometimes challenge these people by suggesting that they would be better off with a business card that said "Made quota 5 years in a row" than the lengthy document they prepared.
Don't assume knowledge of past employers. Or of the products you sold. Instead of just naming them, describe them, even if it is a form that is a name brand in its industry or society.
Use active, not passive terms. This is a best practice for any résumé, not just sales. Using passive verbs gives the impression that you were tangentially related to the work accomplished. Don't be humble. Describe succinctly what you did. And for a sales role, no one cares about facilitating, administrative work, etc.
Don't make excuses for past failures. If a company was shut down while you were working there, indicate that. But I don't want to read the reasons you didn't make quota. You either did or didn't.