Complex sentence: The sailfin molly was originally described in 1821 as "Mollienesia latipinna" by the naturalist Charles Alexandre Lesueur, who based his description upon specimens from freshwater ponds in the vicinity of New Orleans, Louisiana.
Split into simpler sentences: The sailfin molly was originally described in 1821 as "Mollienesia latipinna" by the naturalist Charles Alexandre Lesueur. Lesueur based his description upon specimens from freshwater ponds in the vicinity of New Orleans, Louisiana.