Numerous changes to the first edition of the Book of Mormon were made in the 2nd edition in 1837.
LDS leaders teach current members that only punctuation and grammar corrections were made.

But of the nearly 4,000 alterations, some of them had to do with Joseph's evolving belief about the nature of God.
Notice how these verses changed from Jesus-was-God-the-Father, to Jesus-is-the-Son-of-God-and-not-the-Father. Investigators believe that the evidence clearly shows that Joseph changed his belief that God the Father and Jesus Christ were one being,
to the belief that they were two beings.

Then, he then revised the Book of Mormon in 1837 to support his new idea.

Original 1830 Text		Current, Altered Text Link is here. (Highlighted portion)
1 Nephi 3, p. 25* And he said unto me, Behold, the virgin whom thou seest is the mother of God, after the manner of the flesh * The 1830 text did not have verse divisions.		1 Nephi 11:18 And he said unto me, Behold, the virgin whom thou seest is the mother of the Son* of God*.
1 Nephi 3, p. 25 And the angel said unto me, behold the Lamb of God, even the Eternal Father!		1 Nephi 11:21 And the angel said unto me, behold the Lamb of God, even the Son of the Eternal Father!
1 Nephi 3, p. 26 And I looked and beheld the Lamb of God, that he was taken by the people; yea, the Everlasting God, was judged of the world.		1 Nephi 11:32 And I looked and beheld the Lamb of God, that he was taken by the people; yea, the Son of the Everlasting God, was judged of the world.
1 Nephi 3, p. 32 These last records…shall make known to all kindreds, tongues, and people, that the Lamb of God is the Eternal Father and the Savior of the world.		1 Nephi 13:40 These last records ...shall make known to all kindreds, tongues, and people, that the Lamb of God is the Son of* the Eternal Father and the Savior of the world.*