Complex sentence: As a result of the initial success of "Timebound", Walker released a novella on April 25,2014 called "Time's Echo" to provide some background information on some of the events that occurred behind the storyline of "Timebound".
Split into simpler sentences: As a result of the initial success of "Timebound", Walker released a novella on April 25,2014, called "Time's Echo". It was released to provide some background information on some of the events that occurred behind the storyline of "Timebound".