Complex sentence: James Grant Duff served in the army of the East India Company, from sixteen years of age, playing a role in the final Anglo-Maratha war that led to the end of the Peshwa rule over Pune.
Split into simpler sentences: James Grant Duff joined the army of the East India Company, at sixteen years of age. He played a role in the final Anglo-Maratha war that led to the end of the Peshwa rule over Pune.