Complex sentence: Married to Almira Geraldine Goodsell, he built up the National City Bank of New York, and his son William Goodsell Rockefeller and Elsie Stillman, daughter of National City Bank president James Stillman, were the parents of James Stillman Rockefeller.
Split into simpler sentences: Married to Almira Geraldine Goodsell, he built up the National City Bank of New York. His son William Goodsell Rockefeller and Elsie Stillman, daughter of National City Bank president James Stillman, were the parents of James Stillman Rockefeller.