Complex sentence: In 1900 he moved into St George's Wood, Haslemere, a house designed for him by his son, Robert Falconer MacDonald and the building overseen by his eldest son, Greville MacDonald.
Split into simpler sentences: In 1900 he moved into St George's Wood, Haslemere. A house designed for him by his son, Robert Falconer MacDonald and the building overseen by his eldest son, Greville MacDonald.