Complex sentence: Westall's novel "The Wheatstone Pond", adapted for BBC Radio 4 in 2002, is particularly black in parts and is, in this manner, entirely indistinguishable from an adult novel.
Split into simpler sentences: Westall's novel "The Wheatstone Pond" was adapted for BBC Radio 4 in 2002. Is, in parts, particularly black and is, in this manner, entirely indistinguishable from an adult novel.