John Gee explains:
According to John Gilbert, the typesetter, the printer’s manuscript of the Book of Mormon was unpunctuated: “Every Chapter, if I remember correctly, was one solid paragraph, without a punctuation mark, from beginning to end.” This is in keeping with many ancient languages and scripts that work without punctuation marks. Ancient languages tend to do without typographic punctuation; they use words for punctuation instead. This verbal punctuation provides the signposts that control and structure the flow of the narrative.– Verbal Punctuation in the Book of Mormon I: (And) Now – John Gee
How did Joseph Smith know this? Wouldn’t it have been difficult for Joseph to use verbal punctuation while dictating?