Complex sentence: The plot centers on a case of mistaken identity between a pair of identical twins, which in his afterword Jin Yong acknowledges resemble some works of William Shakespeare (cf. "Twelfth Night" and "The Comedy of Errors").
Split into simpler sentences: The plot centers on a case of mistaken identity between a pair of identical twins. In the afterword, Jin Yong acknowledges that the story resembles some works of William Shakespeare (cf. "Twelfth Night" and "The Comedy of Errors").