1007 B
When they came
The word "they" refers to the participants in the burial procession.
floor of Atad
Possible meanings are 1) the word "Atad" means "thorn" and it may refer to a place where large amounts of thorns grew, or 2) it may be the name of the person who owns the threshing floor. (See: rc://en/ta/man/translate/translate-names)
they mourned with very great and grievous sorrow
"they were extremely sad and they mourned very much"
a seven-day
"a 7-day" (See: rc://en/ta/man/translate/translate-numbers)
in the floor of Atad
Possible meanings are 1) "on the threshing floor that belonged to a man named Atad" or "in the threshing floor at a place called Atad" (See: rc://en/ta/man/translate/translate-names)
This is a very sad occasion for the Egyptians
"The mourning of the Egyptians is very great"
Abel Mizraim
The translator can add a footnote that says: "The name Abel Mizraim means "the mourning of Egypt.'" (See: rc://en/ta/man/translate/translate-names)