Complex sentence: One of the largest clubs is the Banks County chapter of the National FFA Organization, which teaches students about various Career Development Events (CDEs), including electrical safety, in which a Banks County student won a state competition in 2014.
Split into simpler sentences: One of the largest clubs is the Banks County chapter of the National FFA Organization. The FFA organization teaches students about various Career Development Events (CDEs), including electrical safety, in which a Banks County student won a state competition in 2014.