Complex sentence: Like other gusuku, the castle was built using Ryukyu limestone, being surrounded by an outer shell which was built during the Second Sho dynasty from the second half of the 15th century to the first half of the 16th century.
Split into simpler sentences: Like other gusuku, the castle was built using Ryukyu limestone. It is surrounded by an outer shell which was built during the Second Sho dynasty from the second half of the 15th century to the first half of the 16th century.