GMAT Sentence Correction (SC) | Re: She was less successful after she had emigrated to New York compared t

Also, between C and E (both use the structure less.. than),

E is incorrect due to 2 reasons:
1. 'had been' Sounds like as if she is not in New York anymore.. However, in original sentence seems like she is still in New York.
2. ALso, 2 clauses are joined by a comma. That cant be done.