Simplify the following text for a Grade 7 native English-speaking person.
Original: The highest attendance recorded at Portman Road is 38,010 for a match against Leeds United in the FA Cup sixth round on 8 March 1975 .
Simplified: The most people to watch a football match at Portman Road is 38,010 for a match against Leeds United in the FA Cup sixth round on 8 March 1975 .