Complex sentence: Currently, there are two permanent observer non-member states: the Holy See and Palestine, both described as "Non-member States having received a standing invitation to participate as observers in the sessions and the work of the General Assembly and maintaining permanent observer missions at Headquarters".
Split into simpler sentences: Currently, there are two observer non-member states: the Holy See and Palestine. They are both permanent observers, described as "Non-member States having received a standing invitation to participate as observers in the sessions and the work of the General Assembly and maintaining permanent observer missions at Headquarters".