Complex sentence: The defeat of the Piedmontese at Custoza was followed up by the capture of Milan on August 6,1848 by the Austrians before an armistice could be signed later on August 9,1848 between Austria and Sardinia at Vigevano.
Split into simpler sentences: The defeat of the Piedmontese at Custoza was followed up by the capture of Milan on August 6,1848. An armistice was signed on August 9,1848 between Austria and Sardinia at Vigevano.