Complex sentence: He has written several books and published several articles on aging and he is arguably best known for his Facts on Aging Quiz published in 1976 that has been used extensively by researchers to test an individuals general knowledge of aging.
Split into simpler sentences: He has written several books and published several articles on aging. He is arguably best known for his Facts on Aging Quiz published in 1976 that has been used extensively by researchers to test an individuals general knowledge of aging.