Original sentence: The Baaal Shem Tov's grandson, R' Boruch, later held court in Medzhibozh
Edited sentence: It was not until the Baal Shem Tov's grandson, Reb Boruch'l, who held court in his grandfather's home in Mezbuz, that the term "Rebbe" was used for Hasidic spiritual leaders.When Hasidim referred to "The Rebbe", it meant only Reb Boruch'l of Mezbuz