"The complete Ramayana, a great story of Sita."
Let's break it down:
* kavyam: poetry, epic poem
* ramayanam: Ramayana, the epic poem
* krtsnam: complete, whole
* sitayah: of Sita (genitive case)
* caritam: story, narrative
* mahat: great, grand
The sentence emphasizes that the Ramayana is a full and magnificent account of Sita's life and journey.