Simplify the following text for a Grade 10 native English-speaking person.
Original: Philippine historical records indicate that 16th-century hunters hiding in trees used a rock tied to a cord up to 20 feet in length to throw at wild animals beneath them -- the cord enabling retrieval of the rock after missed attempts .
Simplified: Philippine historical records show that 16th century hunters hiding in trees used a rock tied to a string up to 20 feet in length to throw at wild animals beneath them .