Complex sentence: When the book was completed, five publishers rejected it on the grounds that it wasn't suitable for children, but in May, 1973, "Blackberries" was published by T. Y. Crowell.
Split into simpler sentences: When the book was completed, five publishers rejected it on the grounds that it wasn't suitable for children. In May, 1973, "Blackberries" was published by T. Y. Crowell.