Complex sentence: In 1820, Cooper's wife Susan wagered he could write a book better than the one she was reading resulting in a novel entitled "Precaution, or Prevention is Better than Cure" (1820), also known simply as "Precaution".
Split into simpler sentences: In 1820, Cooper's wife Susan wagered that he could write a book better than the one she was reading. In response to the wager, Cooper wrote the novel "Precaution, or Prevention is Better than Cure" (1820), known simply as "Precaution".