Every student of the Bible knows (or should know) that some things in the Bible are hard to understand. One site that helps with this is the Christian Apologetics and Research Ministry Bible Difficulties page.
The reason I mention the site here (other than being useful for Bible study) is for the purpose of finding changes in Bible versions. Some translators and revisers will change those difficult verses to help clarify the meaning. The list of "difficult" verse can help locate changes and sometimes identify translation biases.