Complex sentence: Rabbi Meiselman is Rabbi Joseph B. Soloveitchik's nephew and says they learnt together on a daily basis from the time he was 18 until he was 29 years old.
Split into simpler sentences: Rabbi Meiselman is Rabbi Joseph B. Soloveitchik's nephew. The former says his uncle learnt with him on a daily basis from the time he was 18 until he was 29 years old.