Here is the original item:
A student fascinated with all things ancient
Egyptian. (A)
Kemette squinted at the computer
screen,
(B) hoping
to find the information she needed
(C) to finish
her research paper on Old Kingdom art.
You wanted to do this:
A student fascinated with all things ancient Egyptian. Kemette squinted
at the computer screen, hoping to find the
information that she needed,
to finish her research paper on Old Kingdom art.
Adding a comma after needed is unnecessary. To finish her research paper on Old Kingdom art is an infinitive phrase. When an infinitive phrase ends a sentence, use no punctuation.
You might want to review the rules.