Complex sentence: It was discovered by scientists at the Pfizer research site in Sandwich, UK under the identifier UK-88,525 and previously was marketed by Novartis; however in 2010 US rights for were sold to Warner Chilcott for 400 million US $.
Split into simpler sentences: It was discovered by scientists at the Pfizer research site in Sandwich, UK under the identifier UK-88,525 and used to be marketed by Novartis. In 2010 the US rights were sold to Warner Chilcott for 400 million US $.