Complex sentence: Kempin has represented the United States at the U- 17, U- 18, and U- 20 level, he has made 2 appearances for both the U- 18 and the U- 20 team up to this point.
Split into simpler sentences: Kempin has represented the United States at the U- 17, U- 18, and U- 20 level. He has made 2 appearances for both the U- 18 and the U- 20 team up to this point.