Complex sentence: The Sasang typology (Hangul: 사상의학. Hanja: 四象醫學) is a traditional Korean medical typology, which was systematically theorized by Lee, Je-ma and his book, "Longevity and Life Preservation in Eastern Medicine" (東醫壽世保元, 동의수세보원) in 1894.
Split into simpler sentences: The Sasang typology (Hangul: 사상의학. Hanja: 四象醫學) is a classification scheme in Traditional Korean medicine. It was systematized by Lee, Je-ma in his book, "Longevity and Life Preservation in Eastern Medicine" (東醫壽世保元, 동의수세보원) in 1894.