Complex sentence: Although there is no Halakhic obligation to hold an unveiling ceremony (the ritual became popular in many communities toward the end of the 19th century), there are varying customs about when it should be placed on the grave.
Split into simpler sentences: Although there is no Halakhic obligation to hold an unveiling ceremony--the ritual became popular in many communities toward the end of the 19th century. There are varying customs about when it should be placed on the grave.