Complex sentence: They contained parallel blades and were called the Hands of Palfyn, which were possibly the instruments described by used in Paris by Gregoire father and son, Dussée and Jacques Mesnard.
Split into simpler sentences: They contained parallel blades and were called the Hands of Palfyn. These "hands" were possibly the instruments described by used in Paris by Gregoire father and son, Dussée and Jacques Mesnard.