Complex sentence: The vessel is moored at the Willamette River seawall next to Tom McCall Waterfront Park in downtown Portland when not underway, and the "Portland" now hosts the Oregon Maritime Museum and is owned by the non-profit organization of the same name.
Split into simpler sentences: The vessel is moored at the Willamette River seawall next to Tom McCall Waterfront Park in downtown Portland. When not underway, "Portland" hosts the Oregon Maritime Museum and is owned by the non-profit organization of the same name.