Complex sentence: He worked in health policy and planning from 1973 to 1988: four years as a Research Associate at University of Oregon Health Sciences Center and six years as a manager at the State Health Planning and Development Agency.
Split into simpler sentences: He worked in health policy and planning from 1973 to 1988. Four years as a Research Associate at University of Oregon Health Sciences Center, six years as a manager at the State Health Planning and Development Agency.