Complex sentence: The resulting adult frog often survives and grows, but the deformity makes the frog slower, and more easily caught by a heron or garter snake, whose gut digests the frog, releasing the parasite, which grows to adulthood in there.
Split into simpler sentences: The resulting adult frog often survives and grows, but the deformity makes the frog slower, and more easily caught by a heron or garter snake. Its gut digests the frog, releasing the parasite, which grows to adulthood in there.