Complex sentence: Some species of "Carapus" are thought to be parasitic, consuming the gonads, gut, and other internal parts of their hosts, but when the contents of the guts of "C. mourlani" were examined, no host tissue was found.
Split into simpler sentences: Some species of "Carapus" are parasitic, consuming the gonads, gut, and other internal parts of their hosts. However, when the contents of the guts of "C. mourlani" were examined, no host tissue was found.