Complex sentence: The TOEFL, formally known as Test Of English as a Foreign Language, is a test of an individual's ability to use and understand English in an academic setting designed and administered by Educational Testing Service (ETS) and TOEFL is a registered trademark of ETS.
Split into simpler sentences: The TOEFL, formally known as Test Of English as a Foreign Language, is a test of an individual's ability to use and understand English in an academic setting. The test is designed and administered by Educational Testing Service (ETS), and TOEFL is a registered trademark of ETS.