Complex sentence: Concurrently, she developed a career as a water-colorist; with illustrators Walter Crane and Randolph Caldecott, Greenaway's work revolutionized the children's book book market.
Split into simpler sentences: Concurrently, she developed a career as a water-colorist. With illustrators Walter Crane and Randolph Caldecott, Greenaway's work revolutionized the children's book book market.