Complex sentence: Tongpoo goes into the ship to see if he can control it but becomes disappointed when he can't so decides to blow it up using a gernade being timed to set off once a block of ice melts.
Split into simpler sentences: Tongpoo goes into the ship to see if he can control it and becomes disappointed when he cannot. He decides to blow it up using a gernade being timed to set off once a block of ice melts.