Complex sentence: A memorial service was held in the Greek Orthodox Church of Saint Sophia in West London on 14 February 1989, the same day that a "fatwa" was announced on Salman Rushdie, a close friend of Chatwin's, who attended the service.
Split into simpler sentences: A memorial service was held in the Greek Orthodox Church of Saint Sophia in West London. It happened to be the same day that a "fatwa" was announced on Salman Rushdie, a close friend of Chatwin's, who attended the service.