Complex sentence: In 2009, J.K. Tucker and M.J. Tenorio proposed a classification system for the over 600 recognized species in the family: 3 distinct families and 82 genera for the living species of cone snails.
Split into simpler sentences: In 2009, J.K. Tucker and M.J. Tenorio proposed a classification system for the over 600 recognized species that were in the family. Their classification proposed 3 distinct families and 82 genera for the living species of cone snails.