Original sentence: The second book, Rage of Lions was released Summer 2011, with books 3 & 4 released in 2012, and books 5 & 6 released in the summer and fall of 2013 respectively
Edited sentence: Following the huge success of Book 1, the second book, Rage of Lions, which was originally scheduled to be released in January 2012, has been brought forward to Summer 2011, with books 3 & 4 released in 2012, and books 5 & 6 released in the summer and fall of 2013 respectively