Complex sentence: From the bridge of "Esther", Kramer issues a ransom demand for $25 million or he will blow up "Ruth"; then, if the ransom is still not paid, he will destroy "Jennifer".
Split into simpler sentences: From the bridge of "Esther", Kramer issues a ransom demand for $25 million or he will blow up "Ruth". Then, if the ransom is still not paid, he will destroy "Jennifer".