回复：Guess it implies J-1 quits from univ simply - 回复：Please refer

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How long may I work? J-2 dependents with employment authorization may work until the date on the EAD card or until the J-1 principal visitor completes his or her program, whichever is earlier.
-This section is also confusing. It means if the J1 finishes the program, J2 EAD is invalid even if the EAD does not expires.

J-2 dependents may apply to renew work authorization, as long as the J-1 visitor remains in status.
-From this sentence, J2 EAD can be renewed if J2 continues another program.