Complex sentence: His mother Jeanette Weiss Revson was born in Austro-Hungary of German Jewish ancestry, whose parents immigrated to Boston, Massachusetts in the late 19th century, where they gave birth to 8 other children.
Split into simpler sentences: His mother Jeanette Weiss Revson was born in Austro-Hungary of German Jewish ancestry. His parents emigrated to Boston in the late 19th century, where they had eight other children.