Fortunately, even these heavily edited parts of their narrative can be uncovered fairly easily once one delves a little further into Mormon history in general. We learn early in our research that there were only a couple of paths their migration from Europe to North America took, and that their settlements were small and scattered, leading to a dozen or so communities across the continent, each populated by a handful of intermarrying families. This makes our research a little easier - we have a limited number of towns and names to explore, and their tales all overlap. More importantly, those towns and names and tales are extremely well documented (even if they do leave out a few third wives) - there is no shortage of literature on Mormon history, much of which deals with specific settlements and names plenty of names. The family biographies of early converts and the great migration are well-recorded and not only tell a fascinating tale, but serve as a holy grail to genealogists.
So what are you likely to find in these tales? Aside from the aforementioned polygamy, you're probably going to read a lot about the conversion of each of your ancestors. At the time of Mormonism's founding, there was a lot of disillusionment felt towards the largest churches of the day, in both America and the British Isles. Many felt that Christianity had lost its way - most notably, Joseph Smith - and so when the Book of Mormon found its way into the homes of those many, it struck a chord. Their conversions are well documented for this very reason - they felt that a powerful turning point in their lives, something that no biography would be complete without. You're also likely to find that many of your lines will have intermarried numerous times. Because their settlements were so small at first, it was very common for three sisters to marry three brothers, or for two or three families to exclusively intermarry, sometimes spanning a generation or two. The most interesting things you'll discover, however, will have little to do with religion or marriages. I've many times been awestruck by the intensity and drama of their tales. The will and dedication to leave all they knew behind, to make the arduous trek from Europe to the Americas with little more than they could carry. Children both dying and being born on route; couples leaving with six children and arriving with none, others leaving with 2 and arriving with 4. Sincere devotion and brutal violence. There's really nothing this story doesn't have, and knowing it is a part of your own history is at times maddening, hilarious, moving, embarrassing, and incredible.