Complex sentence: During the Second World War, while FitzGerald worked at Boeing, Tomkins gave birth to the first of their three children, supplemented their income with ceramic works, and began working with egg tempera while sketching out new directions for her painting.
Split into simpler sentences: During the Second World War, while FitzGerald worked at Boeing, Tomkins gave birth to the first of their three children. She supplemented their income with ceramic works, and began working with egg tempera while sketching out new directions for her painting.