Complex sentence: Warden learns that Edwin Gurney, Richildis's son from her first marriage, was present at part of the meal, but stormed out after a quarrel before Bonel ate the partridge.
Split into simpler sentences: Warden learns that Edwin Gurney, Richildis's son from her first marriage, was present at part of the meal. He stormed out after a quarrel before Bonel ate the partridge.