Complex sentence: Oneness Pentecostalism, as with other modalist groups, teach that the Holy Spirit is a "mode" of God, rather than a distinct or separate person in the godhead, and that the Holy Spirit is another name for God the Father.
Split into simpler sentences: Oneness Pentecostalism, as with other modalist groups, teach that the Holy Spirit is a "mode" of God, rather than a distinct or separate person in the Godhead. They instead teach that the Holy Spirit is another name for God the Father.