Complex sentence: Some animals such as the song thrush break the shell of the snail by hammering it against a stone to get at its soft insides, some, like frogs, even eat the whole snail, shell and all.
Split into simpler sentences: Some animals such as the song thrush break the shell of the snail by hammering it against a stone in order to expose its soft insides. Other predators, such as certain species of frogs, even eat the whole snail, shell and all.