Complex sentence: Proponents of seal hunts insist that the animals are killed humanely and the white-coated pups are not taken, while opponents argue that it is irresponsible to kill harp seals as they are already threatened by declining habitat.
Split into simpler sentences: Proponents of seal hunts insist that the animals are killed humanely and the white-coated pups are not taken. Opponents argue that it is irresponsible to kill harp seals as they are already threatened by declining habitat.