Complex sentence: Icos was co-founded in 1989 by George B. Rathmann who was a pioneer in the biotechnology industry and Chief Executive Officer (CEO) and co-founder of the biotechnology company called Amgen, which focused on the development of drugs to treat inflammatory disorders.
Split into simpler sentences: Icos was co-founded in 1989 by George B. Rathmann who was a pioneer in the biotechnology industry and Chief Executive Officer (CEO) and co-founder of the biotechnology company called Amgen. Icos focused on the development of drugs to treat inflammatory disorders.