I just finished reading the book Christ and the New Covenant by Elder Jeffrey R. Holland. While this is a very well written book and it allows the user to gain a plain language approach to the doctrines and principles of the Gospel of Jesus Christ as contained in The Book of Mormon.
If a person is having trouble understanding the doctrines of The Book of Mormon, then this would be a very good book to ACCENT their personal study of The Book of Mormon. If a person is not a member of The Church of Jesus Christ of Latter-day Saints, I think they would find this book a good read and assist them in getting a better understanding in modern English of The Book of Mormon.
Elder Holland does a great job at using plenty of scriptural references to all the standard works [of The Church of Jesus Christ of Latter-day Saints]. Elder Holland relies heavily upon the verses in The Book of Mormon to bring out his thoughts and show the doctrines of the Gospel.