Complex sentence: Fit testing uses simple equipment that places the users face and head into a hood, into which flavored mist is sprayed, usually either bitter or sweet in flavor, with bitter flavors being favored for the almost involuntary reaction of users.
Split into simpler sentences: Fit testing uses simple equipment that places the users face and head into a hood, into which flavored mist is sprayed. Usually either bitter or sweet in flavor, with bitter flavors being favored for the almost involuntary reaction of users.