Complex sentence: Several important members of Chávez's inner government circle are not members of the cabinet, nor even members of the executive branch; instead, they are members of the newly created citizen's branch ("poder ciudadano").
Split into simpler sentences: Several important members of Chávez's inner government circle are "not" official members of the cabinet, nor even members of Chávez executive branch. Instead, they are members of the newly created citizen's branch ("poder ciudadano").