Simplify the following text for a Grade 8 native English-speaking person.
Original: Occasionally they consume humans and human corpses , digging up bodies from shallow graves . This habit of raiding graves caused the villagers of Komodo to move their graves from sandy to clay ground and pile rocks on top of them to deter the lizards .
Simplified: Therefore , people on Komodo Island moved their graves from sandy to clay ground and piled rocks on top to stop the lizards from digging up dead bodies .