Complex sentence: One gigaparsec is about 3.26 billion light-years (3.26 "Gly"), or roughly one fourteenth of the distance to the horizon of the observable universe (dictated by the cosmic background radiation).
Split into simpler sentences: One gigaparsec is about 3.26 billion light-years (3.26 "Gly"). One "Gly" roughly equals one fourteenth of the distance to the horizon of the observable universe (dictated by the cosmic background radiation).