Complex sentence: He said that they were interrogated for only a brief time after their arrival in Guantanamo, and their interrogators had told them they were not regarded as a threat, and that they could expect to be released.
Split into simpler sentences: He said that they were interrogated for only a brief time after their arrival in Guantanamo. Their interrogators had told them they were not regarded as a threat, and that they could expect to be released.