Complex sentence: Amillennialism basically denies a future literal 1000 year kingdom and sees the church age metaphorically described in Rev.20:1-6 in which "Christ's reign" is current in and through the church.
Split into simpler sentences: Amillennialism basically denies a future literal 1000 year Kingdom and sees the church age metaphorically described in Rev.20:1-6. In this view, "Christ's reign" is current in and through the church.