Complex sentence: Pochettino played 20 times for Argentina during a four-year international career and was a participant at the 2002 FIFA World Cup, appearing in three complete matches as the nation exited in the group stage.
Split into simpler sentences: Pochettino played 20 times for Argentina during a four-year international career. He was a participant at the 2002 FIFA World Cup, where he played every minute of all three matches as the nation exited in the group stage.