Complex sentence: Velvet worms are ecdysozoan invertebrate animals of the phylum Onychophora (from Greek, "onyches", "claws"; and "pherein", "to carry") with approximately 200 species, the only phylum within animalia that is wholly endemic to terrestrial environments.
Split into simpler sentences: Velvet worms are ecdysozoan invertebrate animals of the phylum Onychophora (from Greek, "onyches", "claws"; and "pherein", "to carry") with approximately 200 species. It is the only phylum within animalia that is wholly endemic to terrestrial environments.