Original: It is extinct in its largest habitat, Lord Howe Island, and has been called "the rarest insect in the world", as the rediscovered population consisted of fewer than 30 individuals living on the small islet of Ball's Pyramid.
Simplified: It no longer lives in its largest habitat; Lord Howe Island, and has been called "the rarest insect in the world" , because there are less than 30 living today on the small islet of Ball's Pyramid.