Complex sentence: As sawmill work became increasingly specialized and the labour market increasingly competitive, Aboriginal involvement in that sector declined; like other ethnic groups at the time, the Squamish and Tsleil-Waututh shifted focus to specialize in longshoring.
Split into simpler sentences: As sawmill work became increasingly specialized and the labour market increasingly competitive, Aboriginal involvement in that sector declined. Like other ethnic groups at the time, the Squamish and Tsleil-Waututh shifted focus to specialize in longshoring.