Complex sentence: Fränkel, Frank (e) l (פרנקל) is a Jewish family of scholars and Talmudists, the earliest known member of which was Koppel Fränkel (1650), the richest Viennese Jew of his time.
Split into simpler sentences: Fränkel, Frank (e) l (פרנקל) is a Jewish family name. One Fränkel family has many noted scholars and Talmudists, the earliest known member of which was Koppel Fränkel (1650), the richest Viennese Jew of his time.