Complex sentence: Rabbi Schmelke's were Rabbi Yitzhcok Rubin of Brod (grandson of Rabbi Naftali Tzvi of Ropschitz) and Aidel who was the daughter of Rabbi Sholom Rokeach of Belz.
Split into simpler sentences: Rabbi Schmelke's father was Rabbi Yitzhcok Rubin of Brod who was a grandson of Rabbi Naftali Tzvi of Ropschitz. Reb Schmelke's mother was the daughter of Rabbi Sholom Rokeach of Belz.