Complex sentence: They argue that creative writing hones the students abilities to clearly express their thoughts and that that creative writing entails an in-depth study of literary terms and mechanisms so they can be applied to the writer's own work to foster improvement.
Split into simpler sentences: They argue that creative writing hones the students abilities to clearly express their thoughts. They further argue that creative writing also entails an in-depth study of literary terms and mechanisms so they can be applied to the writer's own work to foster improvement.