Complex sentence: Afterwards, the palace was continuously expanded during the reign of King Taejong and King Sejong the Great, but was severely damaged by fire in 1553; its costly restoration, ordered by King Myeongjong, was completed in the following year.
Split into simpler sentences: Afterwards, the palace was continuously expanded during the reign of King Taejong and King Sejong the Great. It was severely damaged by fire in 1553, and its costly restoration, ordered by King Myeongjong, was completed in the following year.