Complex sentence: Edd (Samuel Vincent; the deutereagonist. Mostly referred to as Double Dee) is the brightest of the Eds and the most mature, good-natured, and friendliest of the three.
Split into simpler sentences: Edd (Samuel Vincent; mostly referred to as Double Dee) the deutereagonist. Is the brightest of the Eds and the most mature, good-natured, and friendliest of the three.