Complex sentence: The thorax, abdomen, and wings are densely covered in scales.Some sphingids have a rudimental proboscis, but most have a very long one, used it to feed on nectar from flowers.
Split into simpler sentences: The thorax, abdomen, and wings are densely covered in scales. Sphingids may have a reduced proboscis, but most have a very long one, used it to feed on nectar from flowers.