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To help highlight additional aspects of the products and services you offer, we’re introducing a second line of structured information that can show with your text ads. Now if you select two predefined “Headers” and define two lists of customized values, they can both show with your ads at the same time -- whether that’s a combination of styles and brands or destinations and featured hotels. For example, if you’re a retailer that offers window treatments, you might create one structured snippet for the most popular shutter styles and another for the services you offer.
Note that each structured snippet extension enters the ad auction individually and may show based on a number of factors. Google AdWords: Second Structured Snippet May Be Shown [plus.google.com]