Complex sentence: The family returned to France when Henri was four years old, on the eve of the Franco-Prussian War, and after a short stay in Marseille, settled in Seine-Saint-Denis near Paris where Auguste resumed his trade as a tailor.
Split into simpler sentences: The family returned to France when Henri was four years old, on the eve of the Franco-Prussian War. After a short stay in Marseille, they settled in Seine-Saint-Denis near Paris where Auguste resumed his trade as a tailor.