Complex sentence: The return leg was played at the Ludwigspark Stadion in Saarbrücken, and the match finished as a 4--1 win for AC Milan, which made them able to qualify for the next round.
Split into simpler sentences: The return leg was played at the Ludwigspark Stadion in Saarbrücken. The match finished as a 4--1 win for AC Milan, which made them able to qualify for the next round.