Complex sentence: He made his debut on 1 February 2004 in a 2--1 win over Manchester City; two days later, he scored an own goal against Middlesbrough in the Football League Cup.
Split into simpler sentences: He made his debut on 1 February 2004 in a 2--1 win over Manchester City. Two days later, he scored an own goal against Middlesbrough in the Football League Cup.