Complex sentence: The TARDIS misses Metebelis Three and seems to materialise on a cargo ship in the Indian Ocean, but the Third Doctor and Jo soon realise that the ship's occupants keep repeating their actions as if somehow controlled.
Split into simpler sentences: The TARDIS misses Metebelis Three and seems to materialise on a cargo ship in the Indian Ocean. But the Third Doctor and Jo soon realise that the ship's occupants keep repeating their actions as if somehow controlled.