Complex sentence: Numerous people tried and failed to solve this puzzle, such that it became known as the "Dudeney Problem" and Dudeney's "unique" solution was subsequently given in one of his last puzzle books.
Split into simpler sentences: Numerous people tried and failed to solve this puzzle, such that it became known as the "Dudeney Problem". True to his word, Dudeney's "unique" solution was subsequently given in one of his last puzzle books.