Complex sentence: Later, Ian accidentally stumbles onto the scene of a murder; seeing a man retrieve a cube from the victim's body, he follows him back to his antique shop and is given Tokage's fairy cube--the contained spirit of a fairy.
Split into simpler sentences: Later, Ian accidentally stumbles onto the scene of a murder. Seeing a man retrieve a cube from the victim's body, he follows him back to his antique shop and is given Tokage's fairy cube--the contained spirit of a fairy.