Complex sentence: In 1796, the Herculaneum Pottery was established on the site of an old copper works, the site later became Herculaneum Dock, which was filled in during the 1980s.
Split into simpler sentences: In 1796, the Herculaneum Pottery was established on the site of an old copper works. The site later became Herculaneum Dock, which was filled in during the 1980s.