Complex sentence: In March 1882, the first civilian governor of Cochin China Le Myre de Vilers deemed the treaty of 1874 as unfulfilled which led to the occupation of Hanoi on April 27,1882.
Split into simpler sentences: In March 1882, the first civilian governor of Cochin China, Le Myre de Vilers, deemed the treaty of 1874 unfulfilled. This led to the occupation of Hanoi on April 27,1882.