Complex sentence: Since toothed whales are high on the food chain, they likely consume large amounts of industrial pollutants (bioaccumulation); even baleen whales, by merit of the huge amount of food they consume, are bound to have toxic chemicals stored in their bodies.
Split into simpler sentences: Since toothed whales are high on the food chain, they likely consume large amounts of industrial pollutants (bioaccumulation). Even baleen whales, by merit of the huge amount of food they consume, are bound to have toxic chemicals stored in their bodies.