Complex sentence: The company operates 12 breweries in the United States and nearly 20 in other countries, which increased recently since Anheuser-Busch InBev SA/NV acquired SABMiller.
Split into simpler sentences: The company operates 12 breweries in the United States and nearly 20 in other countries. And that increased recently since Anheuser-Busch InBev SA/NV acquired SABMiller.