Complex sentence: The child of François Renard and Anna-Rose Colin, Renard was born by chance in Châlons du Maine, Mayenne (his father was working there on the construction of a railroad) and grew up in Chitry-les-Mines, (Nièvre).
Split into simpler sentences: The child of François Renard and Anna-Rose Colin, Renard was born by chance in Châlons du Maine, Mayenne where his father was working on the construction of a railroad. Renard grew up in Chitry-les-Mines, (Nièvre).