Complex sentence: Unlike Katanga, however, the proclamation of South Kasai did not explicitly state's inclusion in the Republic of the Congo and instead more resembled the self-declared local governments in Équateur Province.
Split into simpler sentences: Unlike Katanga, however, South Kasai's secession did not explicitly mean the rejection of its position within the Republic of the Congo. Rather, it resembled the self-declared local governments in Équateur Province.