YOU SAID:
sally sells seashells by the seashore.She sells seashells on the seashell shore.The seashells she sells are seashore shells
INTO JAPANESE
彼女は貝殻を海岸で販売しています。彼女が販売している貝殻は海岸の貝殻です。
BACK INTO ENGLISH
She sells shells on the coast. The shells she sells are seashells on the coast.
INTO JAPANESE
彼女は海岸で貝殻を売っています。彼女が売っている貝殻は海岸の貝殻です。
BACK INTO ENGLISH
She sells shells on the coast. The shells she sells are seashells on the coast.
That didn't even make that much sense in English.