Complex sentence: He fabricated tales to one of the prospective buyer that he personally retrieved parts of a scroll from a metal box, which he claimed to have unearthed using a metal detector to locate the metal box with Torah scrolls on the grounds of the Auschwitz concentration camp.
Split into simpler sentences: He fabricated tales to one of the prospective buyer that he personally retrieved parts of a scroll from a metal box at Auschwitz. He claimed to have used a metal detector to unearth a metal box with Torah scrolls on the grounds of the Auschwitz concentration camp.