Complex sentence: The divided highway continues north alongside the river through boreal forest to Tar Island where it slightly northwest; the northbound and southbound lanes diverge as the highway bisects the Suncor Energy and Syncrude plants near Mildred Lake.
Split into simpler sentences: The divided highway continues north alongside the river through boreal forest to Tar Island where it bends slightly northwest. The northbound and southbound lanes diverge as the highway passes between the Suncor Energy and Syncrude plants near Mildred Lake.