Complex sentence: The stadium set its first record breaking attendance with 21,897 against Liverpool F.C. Liverpool were also the first away team to win a competitive match at the stadium, beating Brighton 2-1 in a League Cup tie in September 2011.
Split into simpler sentences: The stadium set its first record breaking attendance with 21,897 against Liverpool. They were also the first away team to win a competitive match at the stadium, beating Brighton 2-1 in a League Cup tie in September 2011.