sentences:  In 1995, the doctrine of the pre-tribulation rapture was further popularized by Tim LaHaye's "Left Behind" series of books, which sold tens of millions of copies and was made into several movies and four real-time strategy video games.The mid-tribulation position espouses that the rapture will occur at some point in the middle of what is popularly called the tribulation period, or during Daniel's 70th Week.The tribulation is typically divided into two periods of 3.5 years each.