Simplify the following text for a Grade 11 native English-speaking person.
Original: Life After Life sold more than 13 million copies , was translated into a dozen foreign languages and became an international best seller , which made the subject of NDEs popular and opened the way for many other studies .
Simplified: Life After Life sold more than 13 million copies and became an international best seller which made the subject of near death experiences popular , and opened the way for many other studies .