Complex sentence: Beatty had requested in his will that he would like to be buried next to his wife Ethel at Dingley: instead he was buried at St Paul's Cathedral and therefore the double grave at Dingley Church only has Beatty's wife buried there.
Split into simpler sentences: Beatty had requested in his will that he would like to be buried next to his wife Ethel at Dingley. Thus the double grave at Dingley Church only has Beatty's wife buried there.