sentences:  Hall recovered to become a regular fixture for Derbyshire once again at the beginning of the 1970s and scored 107 against Middlesex.He scored no centuries in the 1971 season but his average was up to 33.In the 1972 season, Hall averaged 35 in his eleven matches and scored 136 not out against Oxford University and 105 against Glamorgan before he retired from first-class cricket being replaced in Derbyshire's upper order by Anthony Borrington.