Complex sentence: The French victory proved to be the most significant event during the third Austrian attempt to lift the Siege of Mantua during the War of the First Coalition, part of the French Revolutionary Wars.
Split into simpler sentences: The French victory proved to be the most significant event during the third Austrian attempt to lift the Siege of Mantua during the War of the First Coalition. The action took place during the War of the First Coalition, part of the French Revolutionary Wars.