Complex sentence: In its subgenus "Lepidochaetodon"--sometimes considered a separate genus--it is only distantly related to species such as the Sunburst Butterflyfish ("C. kleinii ") and the Tahiti Butterflyfish ("C. trichrous").
Split into simpler sentences: In its subgenus "Lepidochaetodon" it is sometimes considered a separate genus. It is only distantly related to other "Chaetodon" species such as the Sunburst Butterflyfish ("Chaetodon kleinii ") and the Tahiti Butterflyfish ("Chaetodon trichrous").