Complex sentence: On June 15 1846, the Oregon boundary dispute between the United States and Great Britain was resolved with the Oregon Treaty that set the international boundary between the U.S. and British North America in the Oregon country at the 49th parallel.
Split into simpler sentences: On June 15 1846, the Oregon boundary dispute between the United States and Great Britain was resolved with the Oregon Treaty. The treaty set the Oregon Country's international boundary between the U.S. and British North America at the 49th parallel.