Complex sentence: The National Counter Terrorism Security Office (NaCTSO) is not a police organization funded by, and reporting to, the Association of Chief Police Officers, which advises the British government on its counter terrorism strategy.
Split into simpler sentences: The National Counter Terrorism Security Office (NaCTSO) is not a police organization. It is funded by, and reports to, the Association of Chief Police Officers, which advises the British government on its counter terrorism strategy.