Complex sentence: He demobilised from the French Legion on November 27th, 1919, however he remained in France, electing to apply for Naturalization on April 11th, 1927 and getting naturalized on June 26th, 1929.
Split into simpler sentences: He demobilised from the French Legion on November 27th, 1919, however he remained in France. He elected to apply for Naturalization on April 11th, 1927 and was naturalized on June 26th, 1929.