Complex sentence: A woman named Fantine and her illegitimate daughter Cosette arrive, and upon seeing Éponine and her younger sister Azelma, she asks the Thénardiers to take care of Cosette while she goes to look for work.
Split into simpler sentences: A woman named Fantine and her illegitimate daughter Cosette arrive. Upon seeing Éponine and her younger sister Azelma, Fantine asks the Thénardiers to take care of Cosette while she goes to look for work.