Complex sentence: The Randall-Selitto test or paw pressure test is a test to measure the effectiveness of analgetics in animals by observing reaction to pain produced by gradually increasing pressure to an inflamed paw.
Split into simpler sentences: The Randall-Selitto test or paw pressure test is a technique for the measurement of the pain response in animals. It is used in basic pain research and to test the effectiveness of analgetics by observing reaction to gradually increasing pressure on an inflamed paw.