Complex sentence: In 1884 Jean Jules Jusserand took part in the foundation of the Alliance Française, which is a French organisation which aims to promote French culture and reaffirm it; especially after France's defeat against the Germans in 1870.
Split into simpler sentences: In 1884 Jean Jules Jusserand took part in the foundation of the Alliance Française. The Alliance Française is a French organisation which aims to promote French culture and reaffirm it; especially after France's defeat against the Germans in 1870.