Complex sentence: On 22 October, Joffre claimed that the autumn offensive had resulted in important tactical gains, inflicted many casualties and achieved a moral superiority over the Germans and that only a lack of artillery had led to a failure to achieve the strategic objectives of the offensive.
Split into simpler sentences: On 22 October, Joffre claimed that the autumn offensive had resulted in important tactical gains, inflicted many casualties and achieved a moral superiority over the Germans. Only a lack of artillery had led to a failure to achieve the strategic objectives of the offensive.