Complex sentence: Nevertheless, psychiatric research suggests that there are several reasons for the persistence of the notion that people with ADHD have the ability to hyperfocus, such as the well-recognised comorbidity of ADHD with autistic spectrum disorders, of which excess focus is a part.
Split into simpler sentences: Nevertheless, psychiatric research suggests that there are several reasons for the persistence of the notion that people with ADHD have the ability to hyperfocus. For example, a well-recognised comorbidity of ADHD with autistic spectrum disorders, of which excess focus is a part.