Complex sentence: The others, who included the Hokchew, Hokchia and the Henghuas, who came from Northern Fujian and Southern Zhejiang, came relatively late in the late 19th century to Singapore.
Split into simpler sentences: The others, who included the Hokchew, Hokchia and the Henghuas, who came from Northern Fujian and Southern Zhejiang. As these people immigrated relatively late in the late 19th century to Singapore.