Complex sentence: The earliest source for this battle was from "History of the eighteenth century and of the nineteenth till the overthrow of the French empire, with particular reference to mental cultivation and progress", which was published in 1843,55 years after the incident.
Split into simpler sentences: The earliest source for this battle was from the History of the eighteenth century and of the nineteenth till the overthrow of the French empire. With particular reference to mental cultivation and progress, which was published in 1843,55 years after the incident.