Complex sentence: The Comma Johanneum (or Johannine Comma or Heavenly Witnesses) is a comma (a short clause) in the First Epistle of John,, of which the authenticity has been a subject of debate from the early sixteenth century.
Split into simpler sentences: The Comma Johanneum (or Johannine Comma or Heavenly Witnesses) is a comma (a short clause) in the First Epistle of John,. Its authenticity has been a subject of debate from the early sixteenth century.