In this long passage, the original text has a long subordinate clause that is never completed. In his editing for the 1837 edition, Joseph Smith eliminated the lack of closure by deleting the subordinate conjunction after at the beginning of the passage. As discussed above under Enos 1:3, the earliest text sometimes fails to achieve closure. Although such usage is unacceptable in modern discourse structure, it is found fairly often in the original text of the Book of Mormon and will therefore be maintained in the critical text.
In this passage, after deleting the after, Joseph Smith also deleted the perfective auxiliary form had so that the resulting sentence would fit better with the past-tense forms of the overall narrative, as in the preceding text: “they did impart much consolation to the church … these were the names of the sons of Mosiah” (Mosiah 27:33–34). The critical text will, of course, restore the perfective usage since this is how the earliest textual sources read.
Summary: Restore the original subordinate clause with its perfective auxiliary in Mosiah 27:35 (“and after they had traveled throughout all the land of Zarahemla”), despite the fact that this construction never achieves closure.