馬の(うまの)姿に(すがたに)変えられた(かえられた)杜子春の(とししゅんの)亡くなった(なくなった)両親(りょうしん)

Finally, the King of Hell, Enma-daio, appeared and ordered the demons, 'Torture this guy!' Toshishun was tortured, but he kept his promise and continued to endure in silence. Then, the demons brought Toshishun's deceased parents, transformed them into horses, and began whipping them severely.