Complex sentence: Chirac was an only child (his elder sister, Jacqueline, died in infancy before his birth), and was educated in Paris at the Lycée Carnot and at the Lycée Louis-le-Grand.
Split into simpler sentences: Chirac was an only child (his elder sister, Jacqueline, died in infancy before his birth). He then attended the Lycée Carnot and at the Lycée Louis-le-Grand.