Richardson, Richardson and Bentley note that the excessive use of the monotonous conjunction "and" in the Book of Mormon seems awkward and somewhat annoying to the western reader, however, it follows perfect Hebrew syntax. The word "and" often stands before each word (or phrase) in a series; possibly because there was no punctuation in the Hebrew language.
Notice the structure of 4 Nephi 1:5-7:
And there were great and marvelous works wrought by the disciples of Jesus, insomuch that they did heal the sick,
and raise the dead,
and cause the lame to walk,
and the blind to receive their sight,
and the deaf to hear;
and all manner of miracles, did they work among the children of men;
and in nothing did they work miracles save it were in the name of Jesus.
And thus did the thirty and eight year pass away,
and also the thirty and ninth,
and forty and first,
and the forty and second, yea, even until forty and nine years had passed away
and also the fifty and first,
and the fifty and second; yea,
and even until fifty and nine years had passed away.
Other uses of polysyndeton in the Book of Mormon are found in 1 Nephi 2:4; 2 Nephi 33:9; Enos 1:21; Alma 1:29; 7:27; 8:21-23; 9:21; Helaman 3:14; 3 Nephi 4:7; 11:19-20; 17:13-25; Mormon 8:37 and Ether 9:17-27. [Allen H. Richardson, David E. Richardson and Anthony E. Bentley, 1000 Evidences for the Church of Jesus Christ of Latter-day Saints: Part Two-A Voice from the Dust: 500 Evidences in Support of the Book of Mormon, p. 262]