LDS: If the book of Mormon is true then why has it been changed 3913 times?

To be fair, can you tell me where you are getting your information? I've been a member of the LDS church my entire life and have never encountered the Book of Mormon being altered or revised, nor have I ever heard of it being altered or revised. (Let's hope you got your info from legitimate LDS resources, and not anti-Mormon sites that will say and do anything to turn people away from the truth.)