Complex sentence: In the United States, there are numerous Jewish Orthodox organizations, such as Agudath Israel, the Orthodox Union and the National Council of Young Israel; none of which can claim to represent a majority of all Orthodox congregations.
Split into simpler sentences: In the United States, there are numerous Jewish Orthodox organizations, such as Agudath Israel, the Orthodox Union, and the National Council of Young Israel. None of them can claim to represent a majority of all Orthodox congregations.