Complex sentence: Her pen-names imply an Australian self-identification:'Wickham' was after a Brisbane street; it followed her use of John Oland for her first collection, which alludes to the Jenolan Caves in New South Wales.
Split into simpler sentences: Her pen-names imply an Australian self-identification: "Wickham" was adopted after a Brisbane street. She had used "John Oland" for her first collection, which alludes to the Jenolan Caves in New South Wales.