Complex sentence: The other major secular posts also had a tendency to become hereditary, with the chamberlain responsible for royal finances and the constable for organising the crown's military forces, while the marishchal had a leadership role in battle.
Split into simpler sentences: The other major secular posts also had a tendency to become hereditary. The chamberlain responsible for royal finances and the constable for organising the crown's military forces, while the marishchal had a leadership role in battle.