Complex sentence: Cynthia Longfield (1896--1991) Dragonfly expert and explorer, she travelled extensively and published "The Dragonflies of the British Isles" in 1937.
Split into simpler sentences: Cynthia Longfield (1896--1991) was an expert on the dragonfly and an explorer. She travelled extensively and published "The Dragonflies of the British Isles" in 1937.