Complex sentence: With prize money of 50,000 francs in 1911, the Omnium de Deux Ans was the richest juvenile race in France until 1914, exceeding both the Prix Morny and the Grand Critérium.
Split into simpler sentences: With prize money of 50,000 francs in 1911, the Omnium de Deux Ans was France's richest race for two-year-olds. It remained so until 1914, ahead of both the Prix Morny and the Grand Critérium.