Complex sentence: The chemistry and the compounds show more similarity to tungsten than to chromium; the instability of molybdenum (III) and tungsten (III) compounds, for example, contrasts with the stability of the chromium (III) compounds.
Split into simpler sentences: The chemistry and the compounds show more similarity to those of tungsten than that of chromium. An example is the instability of molybdenum (III) and tungsten (III) compounds as compared with the stability of the chromium (III) compounds.