Complex sentence: SmarterChild became very popular with over 30 million "friends" on AOL and MSN over the course of its lifetime, by the end of 2001 over 13 million people had asked it to be on their AOL Instant Messenger buddy lists.
Split into simpler sentences: SmarterChild became very popular with over 30 million "friends" on AOL and MSN over the course of its lifetime. To put SmarterChild's success in perspective, by the end of 2001 over 13 million people had asked it to be on their AOL Instant Messenger buddy lists.