Complex sentence: Two of the sulfur atoms present in the ion are in oxidation state 0 and two are in oxidation state +5, alternatively, the compound can be viewed as the adduct resulting from the binding of the Lewis base S 2 2 − to SO 3.
Split into simpler sentences: Two of the sulfur atoms present in the ion are in oxidation state 0 and two are in oxidation state +5. Alternatively, the compound can be viewed as the adduct resulting from the binding of the Lewis base S 2 2 − to SO 3.