Complex sentence: This led to talks of a title fight against World Boxing Council (WBC) lightweight champion Alexis Argüello, to be held in Miami, but Argüello relinquished the title to move up in weight to challenge junior welterweight champion Aaron Pryor.
Split into simpler sentences: This led to talks of a title fight against World Boxing Council (WBC) lightweight champion Alexis Argüello, to be held in Miami. But Argüello relinquished the title in order to move up in weight to challenge junior welterweight champion Aaron Pryor.