Complex sentence: In British Columbia, Canada, the Fraser River has numerous sloughs and side-channels which may be defined as distributaries, but its final stretch has three main distributaries, the North Arm and the South Arm, and a few smaller ones adjoining them.
Split into simpler sentences: In British Columbia, Canada, the Fraser River has numerous sloughs and side-channels which may be defined as distributaries. Its final stretch has three main distributaries: the North Arm and the South Arm, and a few smaller ones adjoining them.