Complex sentence: In the middle decades of the nineteenth century it was used to transship furs to flatboats from the ox carts used by the fur brigades travelling from Pembina and Fort Garry, Canada on the "West Plains Trail", the westernmost of the Red River Trails.
Split into simpler sentences: In the middle decades of the nineteenth century it was used as a transshipment point in the fur trade. Furs from upstream fur posts and from collection points as far away asPembina and Fort Garry, Canada, were brought by ox cart trains travelling on the "West Plains Trail", the westernmost of the Red River Trails.