Complex sentence: The older boy, Zhao Shi, who was nine years old, was declared emperor, and in 1277 the imperial court sought refuge in Lantau Island's Mui Wo, and later in what is today Kowloon City, Hong Kong.
Split into simpler sentences: The older boy, Zhao Shi, who was nine years old, was declared emperor. In 1277 the imperial court sought refuge first in Lantau Island's Mui Wo and then in what is today Kowloon City, Hong Kong.