Complex sentence: In September 1118 he remained faithful to King Henry I during the rebellon which broke out, but in 1123 he was drawn into a conspiracy with William Clito, son of Robert Curthose.
Split into simpler sentences: In September 1118 he remained faithful to King Henry I during the rebellon which broke out. But in 1123 he was drawn into a conspiracy with William Clito, son of Robert Curthose.