Complex sentence: Pingu tells Robby to stop, Robby puts back the blue crab he's just found, and both of them shoo all the other crabs except the brown-clawed, green one back into the pool.
Split into simpler sentences: Pingu tells Robby to stop and Robby puts back the blue crab he's just found. Both of them shoo all the other crabs except the brown-clawed green one back into the pool.