Complex sentence: It is a tradition within her tribe to send one girl to be a prostitute, and she tells Ram bitterly not to call her beautiful because that is the reason she was chosen instead of her plain-looking sister.
Split into simpler sentences: It is a tradition within her tribe to send one girl to be a prostitute. She bitterly tells Ram not to call her beautiful because that is the reason she was chosen instead of her plain-looking sister.