Complex sentence: New signings for both teams made an appearance, with defender John Arne Riise making his first appearance in English football for Liverpool, while striker Ruud van Nistelrooy made his debut for Manchester United.
Split into simpler sentences: New signings for both teams made an appearance, with defender John Arne Riise making his first appearance in English football for Liverpool. While Striker Ruud van Nistelrooy made his debut for Manchester United.