Complex sentence: A Taoist guidance book called Tiantang Yiuji explained some of these extraordinary skills in details which included the western alchemy of turning stone to gold, TCM and superhuman feats that no longer exist.
Split into simpler sentences: A Taoist guidance book called Tiantang Yiuji explained these extraordinary skills in details. Within these skills there were alchemy in turning stone to gold, TCM and superhuman feats that no longer exist.