Complex sentence: The ship was transporting 6,000 tons of a fertilizer called NPK 151515C from Porsgrunn in Norway to the Spanish Mediterranean port city of Valencia when the captain radioed that there was a "chemical reaction" in his ship's cargo, leading him to stop engines.
Split into simpler sentences: The ship was transporting 6,000 tons of a fertilizer called NPK 151515C from Porsgrunn in Norway to the Spanish Mediterranean port city of Valencia. The captain radioed that there was a "chemical reaction" in his ship's cargo, leading him to stop engines.