Sakigake makes a big deal about how they reject all worldly values, but part of the organization is completely hierarchical, sharply divided between the leadership and the rest of them.
(H. Murakami; 1Q84)

I understand this as follows:
1) The organization (Sakigake) consists of two parts: the leadership and the rest.
2) 'The leadership part' is completely hierarchical, although everybody in 'the rest part' is of the same level.
(This particular understanding may be influenced by the wider context which might be not clear from the sentence in question)

The question is that my reading of this sentence and how the sentence composed do not match. The sentence tells me that there is part that is completely hierarchical and that this very part is divided between the leadership and the rest, which leaves us with another 'unknown part' that is not divided at all, which doesn't tally with my view, which I've formulated above.

What do you think about this sentence?

Thanks.