Simplify the following text for a Grade 10 native English-speaking person.
Original: Numerous fragments of his thirty-seven volume treatise On Nature have been found among the charred papyrus fragments at the Villa of the Papyri at Herculaneum .
Simplified: Many pieces of his thirty-seven volume treatise On Nature have been found in the burnt papyrus fragments at the Villa of the Papyri at Herculaneum .