Complex sentence: Long-whiskered catfish are fishes of the Pimelodidae family (order Siluriformes), a large family of freshwater Central and South American catfishes, reaching from South America and Panama north to southernmost Mexico.
Split into simpler sentences: Long-whiskered catfish are catfishes of the Pimelodidae family (order Siluriformes). Pimelodidae is a large family of freshwater Central and South American catfishes, reaching from South America and Panama north to southernmost Mexico.