Complex sentence: American Treaty of Amity and Commerce signed at Incheon on May 22,1882 because the Joseon Government considered that treaty constituted a de facto mutual defense treaty while the Americans did not.
Split into simpler sentences: American Treaty of Amity and Commerce signed at Incheon on May 22,1882. The Joseon Government considered that treaty constituted a de facto mutual defense treaty while the Americans did not.