Complex sentence: While the catkins of "S. arctica" are rarely eaten by the larvae, they are known to eat its leaves: 97% of larvae which were actively eating at the onset of their feeding season were consuming primarily new leaf buds of this plant.
Split into simpler sentences: While the catkins of "S. arctica" are rarely eaten by the larvae, they readily consume the plant's leaves. One study found that 97% of larvae which were actively eating at the onset of their feeding season were consuming the new leaf buds of this plant.