Complex sentence: On January 5,2014, Children's Hospital released McMath's body to the Alameda County coroner, which then released her body to the custody of her mother, who was warned of and assumed all risk regarding cardiac arrest during the transfer.
Split into simpler sentences: On January 5,2014, Children's Hospital released McMath's body to the Alameda County coroner. After receiving custody of McMath's body from Children's Hospital, the Coroner then released her to the custody of her mother, who was warned of and assumed all risk regarding cardiac arrest during the transfer.