Complex sentence: The Battle of Savenay took place on 23 December 1793, and marks the end of the Virée de Galerne operational phase of the first war in the Vendée, where a Republican force of approximately 18,000 decisively defeated the armée catholique et royale force of 6,000 at Savenay.
Split into simpler sentences: The Battle of Savenay took place on 23 December 1793, and marks the end of the Virée de Galerne operational phase of the first war in the Vendée. A Republican force of approximately 18,000 decisively defeated the Armée Catholique et Royale force of 6,000 at Savenay.