Complex sentence: De Belleval took part in difficult wage negotiations with the Syndicat des Fonctionnaires Provinciaux du Québec in mid- 1979; at one stage, the civil servants took part in rotating walkouts and de Belleval threatened the lock out entire government departments.
Split into simpler sentences: De Belleval took part in wage negotiations with the Syndicat des Fonctionnaires Provinciaux du Québec in mid- 1979. At one difficult stage, the civil servants took part in rotating walkouts and de Belleval threatened the lock out entire government departments.