Complex sentence: One Christmas morning when Santa Claus came, he gave them powers to make real of what they imagine, and also a box of sweets, and a story book which told the story of Hansel and Gretel.
Split into simpler sentences: One Christmas morning when Santa Claus came, he gave them powers to make their imagination come true. Alongside that, he gave them a box of sweets, and a storybook which told the story of Hansel and Gretel.