Complex sentence: He studied six years with his famous grandfather, Rabbi Yosef Eliyahu Henkin, from whom he received semichah, and served as the Rabbi of the Beit She'an valley before moving to Jerusalem.
Split into simpler sentences: He studied six years with his famous grandfather, Rabbi Yosef Eliyahu Henkin, from whom he received semichah. Rabbi Henkin served as the Rabbi of the Beit She'an valley before moving to Jerusalem.