Complex sentence: The most remembered contribution of King Sejong is the creation of Hangul, the Korean alphabet, in 1443; everyday use of Hanja in writing eventually came to an end in the later half of the 20th century.
Split into simpler sentences: The most remembered contribution of King Sejong is the creation of hangul, the Korean alphabet, in 1443. Everyday use of Hanja and hanja in writing eventually came to an end in the later half of the 20th century.