Complex sentence: Professor Wells is the originator of Metacognitive Therapy, a new psychological treatment which is undergoing extensive evaluation in controlled trials, and has written a treatment manual for the application of this model and treatment to anxiety and mood disorders.
Split into simpler sentences: Professor Wells is the originator of Metacognitive Therapy, a new psychological treatment which is undergoing extensive evaluation in controlled trials. He has written a treatment manual for the application of this model and treatment to anxiety and mood disorders.