Original sentence: It is located some 6 miles (9.5 km) north east of Swansea city centre.The 16 mile(26 km) long Swansea Canal was built through the centre of Clydach between 1794 and 1798.Three schools were split, the lower schools were for the 11-13 years olds, and then the last three years of compulsory education was at the Cwmtawe Upper school in Pontardawe
Edited sentence: It is located some 6 miles (9.5 km) north east of Swansea city centre.The 16 mile(26 km) long Swansea Canal was built through the centre of Clydach between 1794 and 1798.Three schools were split, the lower schools were for the 11–13 years olds, and then the last three years of compulsory education was at the Cwmtawe Upper school in Pontardawe