Original: Cuttlefish have an internal shell (the cuttlebone), large W-shaped pupils, and eight arms and two tentacles furnished with denticulated suckers, with which they secure their prey.
Simplified: Cuttlefish have an internal shell (called cuttlebone), large eyes, and eight arms and two tentacles furnished with denticulated, or finely toothed, suckers, with which they secure their prey.