Complex sentence: In her late 20s Koea stopped writing fiction, disillusioned with her lack of success, however ten years later, in 1981, she submitted a story to New Zealand's leading literary contest of the time (the Air New Zealand Short Story Competition) and won.
Split into simpler sentences: In her late 20s Koea stopped writing fiction, disillusioned with her lack of success. However, ten years later, in 1981, she submitted a story to New Zealand's leading literary contest of the time (the Air New Zealand Short Story Competition) and won.