Complex sentence: After his parents are murdered in a freak circus accident, Grayson confides in Batman, the hero advises him not to go to the police concerning what he overheard Anthony Zucco's men planning.
Split into simpler sentences: After his parents are murdered in a freak circus accident, Grayson confides in Batman. The hero advises him not to go to the police concerning what he overheard Anthony Zucco's men planning.