Complex sentence: Rabbi Kamenetsky's son, Rabbi Shmuel Kamenetsky heads the Talmudical Yeshiva of Philadelphia, chairs the Moetzes Gedolei HaTorah and is considered by many to be the "Gadol HaDor" (greatest Rabbi of his generation).
Split into simpler sentences: Rabbi Kamenetsky's son, Rabbi Shmuel Kamenetsky heads the Talmudical Yeshiva of Philadelphia. He chairs the Moetzes Gedolei HaTorah and is considered by many to be the Gadol HaDor (greatest Rabbi of his generation).