Complex sentence: These traces, named "Radulichnus", have been interpreted as circumstantial evidence for the presence of a radula, and in conjunction with the univalve shell has been taken to indicate "Kimberella" was a mollusc or very closely related to molluscs.
Split into simpler sentences: These traces, named "Radulichnus", have been interpreted as circumstantial evidence for the presence of a radula. In conjunction with the univalve shell, this has been taken to indicate "Kimberella" was a mollusc or very closely related to molluscs.