Complex sentence: On January 18,2016, Frey died at the age of 67 in New York City, New York of rheumatoid arthritis, acute ulcerative colitis and pneumonia while recovering from intestinal surgery.
Split into simpler sentences: On January 18,2016, Frey died in New York City at the age of 67. His cause of death was rheumatoid arthritis, acute ulcerative colitis and pneumonia while recovering from intestinal surgery.