Complex sentence: Despite Stockrington No.2 Colliery continuing to work at full capacity, following the closure of the line beyond Stockrington the railway began single line working only, on the "up" line, the "down" line being used for the storage of surplus coal hopper wagons.
Split into simpler sentences: Despite Stockrington No.2 Colliery continuing to work at full capacity, following the closure of the line beyond Stockrington the railway began single line working only. Initially the "up" line was used with the "down" line being used for the storage of surplus coal hopper wagons.