Complex sentence: Subsequent release of classified documentation, suggests the US Embassy exercised due diligence in attempting to determine the whereabouts of FR. Carney, and there investigations have led the US government to conclude it is probable he died in a jungle hammock.
Split into simpler sentences: Subsequent release of classified documentation, suggests the US Embassy exercised due diligence in attempting to determine the whereabouts of FR. Carney. These investigations led the US government to conclude it is probable he died in a jungle hammock.