original: individuals have also illegally destroyed some trees and are suspected of introducing insect pests from australia which attack the trees .
simplifications: some have also illegally destroyed trees and are suspected of introducing pest which attack the trees . some have also illegally destroyed some trees and are suspected of introducing insects from australia which attack the trees . individuals have also wrongly destroyed some trees and are suspected of introducing insect pests from australia which attack the trees . individuals have also illegally destroyed some trees and are suspected of introducing insect pests from australia which attack the trees . individuals have destroyed trees and are also suspected of introducing pests from australia that attack trees . individuals also illegally destroyed trees and are suspected of introducing insects from australia that harm them . people have also wrongfully ruined some trees and are suspected of bringing in harmful bugs from australia which attack the trees . people have also illegally destroyed some trees and are thought to have introducied insect pests from australia which attack the trees .