Original sentence: In 2006 Tyson completed a study to determine whether controlled atmosphere stunning (CAS), which uses gas to render chickens unconscious before slaughter, could be a more humane practice than conventional electrical stunning
Edited sentence: At the request of customers and as part of the company's commitment to animal welfare, Tyson has spent the past two years examining and testing the use of Controlled Atmosphere Stunning (CAS).In 2006 Tyson completed a study to determine whether controlled atmosphere stunning (CAS) could be a more humane practice than conventional electrical stunning.This production method involves the use of a gas mixture to render chickens unconscious before slaughter