Complex sentence: All other orders also contain non-eusocial species, including many lineages where eusociality was inferred to be the ancestral state, thus the number of independent evolutions of eusociality is still under investigation.
Split into simpler sentences: All other orders also contain non-eusocial species, including many lineages where eusociality was inferred to be the ancestral state. Thus the number of independent evolutions of eusociality is still under investigation.