The 5-word string “And it came to pass” appears 1,070 times in the Book of Mormon. On the average, that’s more than 2.01 times per page, or about 16% of the verses.
Mark Twain commented about this excess:
“‘And it came to pass’ was his [Joseph Smith’s] pet. If he had left that out, his Bible would have been only a pamphlet.”
Mark Twain, Roughing It (Hartford, CT: American Publishing Co., 1891), 127-128.