Complex sentence: The Napoleonic wars brought great prosperity but after the war in 1815 equally great depression descended, however during the 1820s there was a gradual return to prosperity sufficient to give the Botfields confidence to invest and develop the 72 acres at Dark Lane.
Split into simpler sentences: The Napoleonic wars brought great prosperity but after the war in 1815 equally great depression descended. During the 1820s there was a gradual return to prosperity, sufficient to give the Botfields confidence to invest and develop the 72 acres at Dark Lane.