3 Nephi 5:10

therefore I have made my record of these things according to the record of Nephi, which were engraven on the plates which were called the plates of Nephi.

So I have made my record based on Nephi’s record. His record was carved on plates called the plates of Nephi.

I’ve based my record on Nephi’s account, which was engraved on the plates called the plates of Nephi.