Complex sentence: He survived the Sinestro Corps War without major injuries, he continues to hold onto his position as keeper of the Book of Oa but is kept out of the loop in some instances by the Guardians who neglected to tell him their plans to create the Alpha Lanterns.
Split into simpler sentences: He survived the Sinestro Corps War without major injuries, he continues to hold onto his position as keeper of the Book of Oa. He is kept out of the loop in some instances by the Guardians who neglected to tell him their plans to create the Alpha Lanterns.