Complex sentence: The OSE ran Children's Homes (often called "Chateaux," but actually large "mansions," and see listing below) for Jewish children of various ages, including infants, whose parents were either in Nazi concentration camps or had been killed.
Split into simpler sentences: The OSE ran Children's Homes (often called "Chateaux," but actually large "mansions," and see listing below). These Homes were for Jewish children of various ages, including infants, whose parents were either in Nazi concentration camps or had been killed.