Simplify the following text for a Grade 9 native English-speaking person.
Original: The lowest average attendance at Portman Road was 8,741 in the club 's inaugural league season , the 1936 â `` 37 season in Division Three ( South ) .
Simplified: The lowest average attendance at Portman Road was 8,741 in the club 's first professional season , the 1936 â `` 37 season .