Complex sentence: In the writing portion, students demonstrate their ability to write in the interpersonal mode by replying to an e-mail message, and in the presentational mode by writing a persuasive essay based on three sources that present different viewpoints on a topic.
Split into simpler sentences: In the writing portion, you will demonstrate your ability to write in the Interpersonal mode by reading and replying to an e-mail message. Then using the Presentational mode, you will write a persuasive essay based on three sources that present different viewpoints on a topic.