Original sentence: Although the use of bitless bridles is not especially controversial (most equestrians finding them useful in at least some circumstances, some authors and manufactureres of bitless bridles maintain that a bit may cause physical as well as mental problems in the horse
Edited sentence: Hiltrud Strasser's book Metal In The Mouth outlines many of the potential problems associated with bits and horses.Metal in the Mouth.Robert Cook & Hiltrud Strasser, 2002.The Abusive Effects of Bitted Bridles, W.There is a growing body of evidence which supports the notion that the bit may cause physical as well as mental problems in the horse