Complex sentence: Saint-Exupéry was born in Lyon to an aristocratic family that could trace its lineage back several centuries, the third of five children of Marie de Fonscolombe and comte Jean de Saint Exupéry.
Split into simpler sentences: Saint-Exupéry was born in Lyon to an aristocratic family that could trace its lineage back several centuries. He was the third of five children of Marie de Fonscolombe and comte Jean de Saint Exupéry.