Complex sentence: Ronaldo was the second-highest scorer in the 2006 FIFA World Cup qualification in the European zone with seven goals, and scored his first World Cup goal against Iran (2--0) with a penalty kick in Portugal's second match in the group stage.
Split into simpler sentences: Ronaldo was the second-highest scorer in the European qualification for the 2006 FIFA World Cup with seven goals. During the tournament, he scored his first World Cup goal against Iran with a penalty kick in Portugal's second match of the group stage.