Complex sentence: After analyzing the carcass of the dead squid, the scientists determine it is just a baby, but the information comes too late and the huge adult squid attacks the submersible and everyone on board is killed.
Split into simpler sentences: After analyzing the carcass of the dead squid, the scientists determine it is just a baby. The information comes too late, however, and the huge adult squid attacks the submersible and everyone on board is killed.