Complex sentence: The Rally Argentina is an Argentine rally competition that has been both a round of the World Rally Championship, the Intercontinental Rally Challenge, the Codasur South American Rally Championship and the Argentine Rally Championship.
Split into simpler sentences: The Rally Argentina is an Argentine rally competition that has been both a round of the World Rally Championship and also the Intercontinental Rally Challenge. The rally is also a round of the South American Rally Championship and the Argentine Rally Championship.