Complex sentence: Following the death of 'Abdu'l-Bahá, Shoghi Effendi vacationed in Esslemont's familiar area of Bournemouth, and later Esslemont took permanent residence in Palestine to assist Effendi who then also helped further refine Esslemont's book.
Split into simpler sentences: Following the death of 'Abdu'l-Bahá, Shoghi Effendi vacationed in Esslemont's familiar area of Bournemouth. Subsuquent to this, Esslemont took permanent residence in Palestine to assist Shoghi Effendi, who then also helped further refine Esslemont's book.