Complex sentence: While Beneventum was indecisive, Pyrrhus realised his army had been exhausted and reduced, by years of foreign campaigns, and seeing little hope for further gains, he withdrew completely from Italy.
Split into simpler sentences: While Beneventum was indecisive, Pyrrhus realised his army had been exhausted and reduced by years of foreign campaigns. Seeing little hope for further gains, he withdrew completely from Italy.