Complex sentence: Luo Helou and his wife had five sons and five daughters, of whom only three daughters survived infancy; this was a blow to their societal status, for in Chinese society at the time, only sons could continue the family lineage.
Split into simpler sentences: Luo Helou and his wife had five sons and five daughters, of whom only three daughters survived infancy. The couples' lack of adult sons diminished their societal status, for in Chinese society at the time, only sons could continue the family lineage.