Complex sentence: In 2006, additional changes were made to IDEA as final regulations were released, which required schools to use research based interventions in the process of assisting students with learning difficulties or determining eligibility for special education.
Split into simpler sentences: In 2006, additional changes were made to IDEA as final regulations were released. They required schools to use research based interventions in the process of assisting students with learning difficulties, or determining eligibility for special education.