Complex sentence: Context-sensitive grammars are however less general (in the same sense of the term) than unrestricted grammars, i.e. CSG occupy the intermediate position between context-free and unrestricted grammars in the Chomsky hierarchy.
Split into simpler sentences: Context-sensitive grammars are less general (in the same sense) than unrestricted grammars. Thus, CSG are positioned between context-free and unrestricted grammars in the Chomsky hierarchy.