Complex sentence: During Lukang's heyday from 1785 to 1845, Lukang's population reached 200,000 and was Taiwan's second largest city after Tainan and larger than Taipei, then the island's third-largest city.
Split into simpler sentences: During Lukang's heyday from 1785 to 1845, Lukang's population reached 200,000. Lukang was Taiwan's second largest city after Tainan and was larger than Taipei, then the island's third-largest city.