Simplify the following text for a Grade 11 native English-speaking person.
Original: Its scientific contributions include machine safeguarding guidelines , the Cornell-Liberty Survival Car , and ergonomic guidelines that have informed the basis for national and international safety standards .
Simplified: Its work has helped to specify machine safeguarding guidelines ( how to work safely with machines ) , the Cornell-Liberty Survival Car , and ergonomic guidelines . They helped to form the basis for national and international safety standards .