Complex sentence: This has prompted the greater use of teaching TEPS in the South Korean classroom--because the South Korean public school teachers are unable to compete with the native speaking English language teachers in the hakwons, they have created an exam that tests Konglish, not English.
Split into simpler sentences: This has prompted the greater use of teaching TEPS in the South Korean classroom. As a result, they have created an exam that tests Konglish, not English.