Complex sentence: It was largely due to the counsel of Perceval, that Henry Cromwell stayed out of the anarchy that engulfed England after the death of his father; in particular his passive behaviour over his elder brother Richard's removal from the office of Lord Protector.
Split into simpler sentences: It was largely due to the council of Perceval, that Henry Cromwell stayed out of the anarchy that engulfed England after the death of his father. In particular his passive behaviour over his elder brother Richard's removal from the office of Lord Protector.