Complex sentence: It will be the fifth novel within the "Discworld" series to be based on the character of Tiffany Aching, and is to be published in the UK on 10th September 2015.
Split into simpler sentences: It will be the fifth novel within the "Discworld" series to be based on the character of Tiffany Aching. It is to be published in the UK on 10th September 2015.