Complex sentence: Although the relevant questions in the probable lie test are used to obtain a reaction from liars, the physiological reactions that "distinguish" liars may also occur in innocent individuals who fear a false detection or feel passionately that they did not commit the crime.
Split into simpler sentences: Although the relevant questions in the probable lie test are used to obtain a reaction from liars, it can also gain a reaction from the innocent subject who is afraid of false detection. The physiological reactions that "distinguish" liars, may also occur in individuals who fear a false detection, or feel passionately that they did not commit the crime.