Complex sentence: Subsequently a further book,'Diary of An On Call Girl' has been published, based on the blog of PC Ellie Bloggs, and a further book is in production based on the blog of an Inspector Gadget.
Split into simpler sentences: Subsequently a further book,'Diary of An On Call Girl' has been published based on the Police blog of WPC Ellie Blogs. A further book is in production based on the Police blog of Inspector Gadget.