Complex sentence: Between July 2016 and December 2017 Northern will operate a peak morning working between Bradford and Leeds using a Class 180 set hired from Grand Central Railway releasing other DMUs to cover the reduction in the number of units available to hire from TransPennine Express.
Split into simpler sentences: Between July 2016 and December 2017 Northern will operate a peak morning working between Bradford and Leeds using a Class 180 set hired from Grand Central Railway. This is to release other DMUs to cover the reduction in the number of units available to hire from TransPennine Express.