Complex sentence: His oldest son is Rabbi Yisroel and his other son is Rabbi Menachem Mendel, named after the founding Vizhnitzer Rebbe, author of Tzemach Tzaddik, both are leading congregations of their own in Bnei Brak.
Split into simpler sentences: His oldest son is Rabbi Yisroel and his other son is Rabbi Menachem Mendel, named after the founding Vizhnitzer Rebbe, author of "Tzemach Tzaddik". Both are leading congregations of their own in Bnei Brak.