Complex sentence: Harm Kolthek Jr. was a Dutch printer, journalist, trade unionist and libertarian socialist politician who led the syndicalist federation of trade unions, the National Labor Secretariat (NAS), from 1907 to 1913.
Split into simpler sentences: Harm Kolthek Jr. was a Dutch printer, journalist, trade unionist and libertarian socialist politician. Kolthek led the syndicalist federation of trade unions, the National Labor Secretariat (NAS), from 1907 to 1913.