Complex sentence: Her in-laws who owned the residence were forced to the ground, tied up and threatened to be killed if they reported the crime, the break-in was therefore not reported until the actual kidnapping of Stauffer herself five years later.
Split into simpler sentences: Her in-laws who owned the house were forced to the ground, tied up and threatened to be killed if they reported the crime. Therefore, the break-in was not reported until the actual kidnapping of Stauffer took place five years later.