Complex sentence: The story itself is loosely based around Billy, a young boy who has always dreamed of owning a sweet shop, especially since there is an abandoned one named The Grubber (an old English word for sweet shop) near where he lives.
Split into simpler sentences: The story itself is told from the point of view of Billy, a young boy who has always dreamed of owning a sweet shop. His ambition is strengthened by the fact that there is an abandoned building named The Grubber (an old English word for a sweet shop) near where he lives.