Complex sentence: Since 1979 she has been a bestselling romance novelist under her more well-known pseudonym Diana Palmer, later she wrote a science fiction as Susan S. Kyle, though she has also written as Diana Blayne, Katy Currie, and as her married name Susan Kyle.
Split into simpler sentences: Since 1979 she has been a bestselling romance novelist under her more well-known pseudonym Diana Palmer. She has also written as Diana Blayne, Katy Currie, and as her married name Susan Kyle.