It means that the bourgeoisie of the center, the only one that exists on the scale of the world system, exploits the proletariat every­where, at the center and at the periphery, but that it exploits the proletariat of the periphery even more brutally, and that this is possible because the objective mechanism upon which is based the unity that links it to its own proletariat, in an autocentric economy, and which restricts the degree of exploitation it carries out at the center, does not function at the extraverted periphery.

Talk about a garden path sentence. Am I understanding this right?

[The center’s owners exist across the whole world. They’re the only class that this is true for. They exploit both the center’s workers and the periphery’s workers. However, they exploit the periphery’s workers more brutally. This is possible because the center’s economy is more self-centered, so it’s easier for the center’s workers to push back on brutality. The periphery’s economy, however, is focused on exports.]

It’s very possible I’m misreading the sentence or misunderstanding the meaning of the words “autocentric” and “extraverted” in context or in practice