Original sentence: However, the field is still not available to allow the grass to grow.On 25 May 2009, the track and field is officially opened for physical education lessons and CCAs to carry out activities there
Edited sentence: On 25 May 2009, the track and field is officially opened for physical education lessons, CCAs, students and staff to carry out activities there.The field was initially not available for activities to allow the grass to grow until 3 August 2009, where the school took over the field from the contractor