Complex sentence: Multnomah Channel is a distributary of the Willamette River that splits from the main stem a few miles upstream of the Willamette's convergence with the Columbia River in Multnomah County in the U.S. state of Oregon.
Split into simpler sentences: Multnomah Channel is a distributary of the Willamette River. It diverges from the main stem a few miles upstream of the Willamette's convergence with the Columbia River in Multnomah County in the U.S. state of Oregon.