Complex sentence: He founded the Universal Israelite Alliance in Paris in 1860, becoming its president four years later, and while in the government of the national defence he secured the franchise for the Jews in French Algeria, through the 1870 "Décret Crémieux".
Split into simpler sentences: He founded the Universal Israelite Alliance in Paris in 1860, becoming its president four years later. While in the government of the national defence he secured full citizenship for the Jews in French-ruled Algeria, through the 1870 "Décret Crémieux".