The English is not easy, even for native speakers. Although it's not recommended, you can try an easy-to-read version which is written in modern English. You can find an unofficial easy-to-read version online or in print. There is an official "Book of Mormon Stories" that is written in easy English. You can probably download it.
Beware of miserable people who write calumnies for profit. They make a small fortune writing about groups and religions that they don't like.