Complex sentence: During the administration of President Bill Clinton, Díaz was appointed to serve in the National Council on Aging, a nonprofit advocacy and service organization that focuses its efforts on improving the health and economic security of millions of struggling older adults.
Split into simpler sentences: During the administration of President Bill Clinton, Díaz was appointed to serve in the National Council on Aging. The National Council on Aging (NCOA) is a nonprofit advocacy and service organization that focuses its efforts on improving the health and economic security of millions of struggling older adults.