"Those doctors are surgeons."
Translation:HaqwI'pu' chaH Qelpu'vetlh'e'.
When the subject (in this case, "those doctors") of a third-person pronoun ('oH/bIH/ghaH/chaH) is given explicitly, it always (except in sloppy speech or certain non-standard dialects) takes the topic suffix -'e'.
targh 'oH. = "It is a targ."
SajwIj 'oH. = "It is my pet."
targh 'oH SajwIj'e'. = "My pet is a targ."
SajwIj 'oH targh'e'. = "The targ is my pet."
I recommend going over the lesson notes for the "Pronouns" skill, where the grammar of such sentences is described.