Complex sentence: The Centenary Institute Sieroterapico Achille Sclavo, now American-owned and under other brand, (Novartis Vaccines) produces vaccines and employs about a thousand people.
Split into simpler sentences: The Centenary Institute Sieroterapico Achille Sclavo, is now American-owned and operates under the company name, (Novartis Vaccines). Novartis produces vaccines and employs about a thousand people.