Complex sentence: The witchetty grub (also spelled witchety grub) is a term used in Australia for the large, white, wood feeding larvae of cossid moths (Cossidae), ghost moths (Hepialidae) and longicorn beetles (Cerambycidae).
Split into simpler sentences: The witchetty grub (also spelled witchety grub) is a term used in Australia for the large, white, wood-eating larvae of several moths. The term also applies larvae of to ghost moths (Hepialidae) and longicorn beetles (Cerambycidae).