Complex sentence: The Omotic languages were formerly classified as the West subgroup of the Cushitic languages, but as more data became available, Harold Fleming proposed that they constituted a separate subgroup of Afro-Asiatic, and this has become the prevalent view.
Split into simpler sentences: The Omotic languages were formerly classified as the West subgroup of the Cushitic branch of the Afro-Asiatic language family. However, as more data became available, Harold Fleming proposed that they constituted a separate subgroup of Afro-Asiatic, and this became the prevalent view.