Complex sentence: The Oklahoma Hospital Association (OHA) (the state affiliate of the American Hospital Association) was established in 1919 and represents the more than 150 hospitals and health care entities in the U.S. state of Oklahoma.
Split into simpler sentences: The Oklahoma Hospital Association (OHA) is the state affiliate of the American Hospital Association. It was established in 1919 and represents the more than 150 hospitals and health care entities in the U.S. state of Oklahoma.