Complex sentence: British Writer Helen Dunmore was inspired in part by the Mermaid of Zennor and in 2005 published her first book of the "Ingo Chronicles", the fifth instalment is due in 2012.
Split into simpler sentences: British Writer Helen Dunmore was inspired in part by the Mermaid of Zennor when writing her the "Ingo Chronicles". In 2005 Dunmore published the first book of the series, Ingo, the fifth instalment is due in 2012.