Complex sentence: After his release from Guantanamo Bay detainment camp on April 12 2007 he has given cause for alarm in Kabul by calls for a unity-government in Afghanistan because it guaranteed that terrorist activities will not be supported from within Afghan territory again.
Split into simpler sentences: After his release from Guantanamo Bay detainment camp on April 12 2007 he has given cause for alarm in Kabul by calls for a unity-government in Afghanistan. It guaranteed that terrorist activities will not be supported from within Afghan territory again.