Complex sentence: This led to the dismissal of a worker (on some other pretext), which set off the strike Raw pp.107ff with approximately 1,400 women and girls refusing to work by the end of the first day.
Split into simpler sentences: This led to the dismissal of a worker (on some other pretext), which set off the strike. Approximately 1,400 women and girls were refusing to work by the end of the first day.