Complex sentence: With this, he secured the support of the country electors; and, although only thirty, comparatively poor, and lacking patronage, he was elected fifth deputy of the Third Estate of Artois to the Estates-General.
Split into simpler sentences: With this, he secured the support of the country electors. Although he was only thirty years old, comparatively poor, and lacking patronage, he was elected fifth deputy of the Third Estate of Artois to the Estates-General.