Complex sentence: The Howard Hughes Medical Institute (HHMI) is a United States non-profit medical research institute based in Chevy Chase, Maryland and originally founded by the aviator and engineer and former trustee Howard Hughes in 1953.
Split into simpler sentences: The Howard Hughes Medical Institute (HHMI) is a United States non-profit medical research institute based in Chevy Chase, Maryland. It was originally founded by the aviator, engineer, and former trustee Howard Hughes in 1953.