Complex sentence: The school has 1,200 pupils and operates on two major sites about half a mile apart, one for the lower school (years 7 to 9) is situated at Brougham Hayes, Lower Oldfield Park and the other for the upper school in Upper Oldfield Park.
Split into simpler sentences: The school has 1,200 pupils and operates on two major sites less than half a mile apart. The Lower School (years 7 to 9) is situated at Brougham Hayes, Lower Oldfield Park, while the Upper School is resides in Upper Oldfield Park.