Complex sentence: On November 4, the alcohol results came back from the toxicology center, and results showed that the captain of the "Ethan Allen" had been drinking several days prior to October 2 but that he did not drink alcohol on the day of the accident.
Split into simpler sentences: On November 4, the alcohol results came back from the toxicology center. They showed that the captain of the "Ethan Allen" had been drinking several days prior to October 2 but that he did not drink alcohol on the day of the accident.