Complex sentence: In 1901, the United States established the Philippine Constabulary for purpose of assisting in combating the remnants of the revolutionaries, and after the war served as the state gendarmerie force composed of, from the start, both Americans and Filipinos.
Split into simpler sentences: In 1901, the United States established the Philippine Constabulary for the purpose of assisting in combating the remnants of the revolutionaries. After the war, this served as the state gendarmerie force composed of, from the start, both Americans and Filipinos.