Original sentence: The Our Boy's Institute included lecture and games rooms, indoor running track, pool, and was available for boys aged 13-18, 'a forefunner to the various youth groups which flourished in the first half of the twentieth century' such as the Boys Brigade, Scouting, etc
Edited sentence: The Our Boy's Institute included lecture and games rooms, indoor running track, pool, and was available for boys aged 13–18, 'a forefunner to the various youth groups which flourished in the first half of the twentieth century' such as the Boys Brigade, Scouting, etc