YOU SAID:

There’s his car and her car, his towels and her towels, and his library and hers.

INTO JAPANESE

彼の車、彼女の車、彼のタオルと彼女のタオルと彼女彼の図書館があります。

BACK INTO ENGLISH

His car, her car, his towel and her towel and she has his library.

INTO JAPANESE

彼の車、彼女の車、彼のタオルとタオルと彼女は、彼のライブラリです。

BACK INTO ENGLISH

His car, her car, his towel and towel and she is his library.