Complex sentence: The novel focuses on the life and exploits of its Fevvers, a woman who is--or so she would have people believe--a Cockney virgin, hatched from an egg laid by unknown parents and ready to develop fully-fledged wings.
Split into simpler sentences: The novel focuses on the life and exploits of its main female protagonist, known as Fevvers. Fevvers is--or so she would have us believe--a Cockney virgin, hatched from an egg laid by unknown parents ready to develop fully fledged wings.