Complex sentence: Schlossberg grew up in large extended family of Russian Jews in the Upper West Side and all four of his great-grandparents were Ellis Island immigrants who were born within 50 miles of one another in the vicinity of Poltava, Russia.
Split into simpler sentences: Schlossberg grew up in large extended family of Russian Jews in the Upper West Side. His great-grandparents were Ellis Island immigrants who were born within 50 miles of one another in the vicinity of Poltava, Russia.