Complex sentence: In 1895 there were 39 tread-mills and 29 cranks in use in English prisons, and these had diminished to 13 and 5 respectively in 1901, as the use of treadwheels was abolished in Britain in 1902 by the Prisons Act (1898).
Split into simpler sentences: In 1895 there were 39 tread-mills and 29 cranks in use in English prisons, and these had diminished to 13 and 5 respectively in 1901. The use of treadwheels was abolished in Britain in 1902 by the Prisons Act (1898).