Complex sentence: At present, there is no agreement as to the systematic placement of the Vetulicola, represented by seven species from Chengjiang: originally described as crustacean arthropods, the Vetulicola were later erected as a new phylum of primitive deuterostomes by D.G. Shu et al.
Split into simpler sentences: At present, there is no agreement as to the systematic placement of the Vetulicola, represented by seven species from Chengjiang. Originally described as crustacean arthropods, the Vetulicola were later erected as a new phylum of primitive deuterostomes by D.G. Shu et al.