Complex sentence: His ancestors traced their line to the famed Han Dynasty prime minister Xiao He, and if their records were accurate, Xiao Daocheng was Xiao He's 24-generation descendant.
Split into simpler sentences: His ancestors traced their line to the famed Han Dynasty prime minister Xiao He. If their records were accurate, Xiao Daocheng was Xiao He's 24-generation descendant.