Simplify the following text for a Grade 9 native English-speaking person.
Original: The Iberian Cup , also called Iberian Supercup , was an international competition between clubs from Portugal and Spain , disputed by two teams ( one portuguese and one spanish ) that were champions in a major competition , very much alike a Supercup , to find out which was the best team from Iberian Peninsula .
Simplified: This competition is a Iberian Supercup .