Complex sentence: Seng Sae Khu (also known as Khu Chun Seng;) was a Hakka Chinese immigrant from Fengshun, Meizhou, Guangdong who arrived in Thailand (then named Siam) in the 1860s.
Split into simpler sentences: Seng Sae Khu (also known as Khu Chun Seng;) was a Hakka Chinese immigrant from Fengshun, Meizhou, Guangdong. He arrived in Thailand (then named Siam) in the 1860s.