Complex sentence: In 1840 the settlement had over 4800 people of which 1,630 took part in the summer hunt and headed south on the prairie while another smaller portion would join the York boat brigades including the Portage La Loche Brigade heading north.
Split into simpler sentences: In 1840 the settlement had over 4800 people of which 1,630 took part in the summer hunt and headed south on the prairie. Another smaller portion of the population would join the York boat brigades including the Portage La Loche Brigade heading north.