YOU SAID:

she sells sea shells on the sea shore and the sea shells that she sells are sea shells I'm sure

INTO JAPANESE

彼女は海岸で海の貝殻を売り、彼女が売る海の貝殻は海の貝殻だと確信している

BACK INTO ENGLISH

She sells seashells on the coast, convinced that the seashells she sells are seashells

INTO JAPANESE

彼女は貝殻が貝殻であると確信して、海岸で貝殻を売っている

BACK INTO ENGLISH

she sells seashells on the coast, convinced that the shells are seashells

INTO JAPANESE

彼女は、貝殻が貝殻であると確信して、海岸で貝殻を売っている

BACK INTO ENGLISH

she sells seashells on the coast, convinced that they are shells

INTO JAPANESE

彼女は、貝殻が貝殻であると確信して、海岸で貝殻を売っている

BACK INTO ENGLISH

she sells seashells on the coast, convinced that they are shells