Complex sentence: In July 2007, Keays was diagnosed with myeloma, which caused his kidneys to fail, as of February 2009, the bone cancer is in remission after chemotherapy and stem-cell transplants.
Split into simpler sentences: In July 2007, Keays was diagnosed with myeloma, which caused his kidneys to fail. As of February 2009, the bone cancer is in remission after chemotherapy and stem-cell transplants.