Complex sentence: At the time, Telz had a small yeshiva for local students, which had been founded in 1875 by Rabbi Meir Atlas, Rabbi Zvi Yaakov Oppenheim and Rabbi Shlomo Zalman Abel.
Split into simpler sentences: At the time, Telz had a small yeshiva for local students. The Telz Yeshiva, had been founded in 1875 by Rabbi Meir Atlas, Rabbi Zvi Yaakov Oppenheim and Rabbi Shlomo Zalman Abel.