Complex sentence: Bell miners specialize in consuming psyllids and their associated young nymphs, sweet lerps, and other psyllid secretions, and psyllids/nymphs/lerps may consist up to 90% of the bell miner's diet.
Split into simpler sentences: Bell miners specialize in consuming psyllids and their associated young nymphs, sweet lerps, and other psyllid secretions. Psyllid products may consist up to 90% of the bell miner's diet.