Complex sentence: A half a year after his Bar Mitzva he completed his learning there, when his grandfather got him Rabbi Chaim Kamil as a chavrusa, and they learned in Yeshivas Mir where he was recognized as an outstanding student.
Split into simpler sentences: A half a year after his Bar Mitzva, he completed his learning there, when his grandfather got him Rabbi Chaim Kamil as a chavrusa. They learned in Yeshivas Mir where he was recognized as an outstanding student.