The verb "حرّ" (ḥarra) in the past tense, conjugated for the third person singular feminine, is حرّرت (ḥarrarat).
Therefore, the complete phrase "الحرية شمس كاملة" in the past tense would be:
حرّرت الحرية شمسًا كاملةً (ḥarrarat al-ḥurriyyah shamsan kāmilatan).
This translates to "Freedom liberated a complete sun."
Please note that this is a metaphorical expression, and the exact meaning may vary depending on the context.