Complex sentence: In World War I, the other male heirs to a British peerage were killed, and Phryne's father inherited the title; as his daughter, she was granted the title "The Honourable Phryne Fisher" and an enormous fortune.
Split into simpler sentences: In World War I, the other male heirs to a British peerage were killed, and Phryne's father inherited the title. As his daughter, she was granted the style of "The Honourable Phryne Fisher" and an enormous fortune.