Complex sentence: Nicholas Kollerstrom (born c.1947) is a British historian of science, a former lunar gardening correspondent for BBC online, and a former honorary fellow of University College, London (UCL).
Split into simpler sentences: Nicholas Kollerstrom (born c.1947) is a British writer and historian of science. He is a former lunar gardening correspondent for BBC online, and a former honorary fellow of University College, London (UCL).