original: The city declined after the war and recovered its importance only in the nineteenth century, when it grew as an industrial center.
simplifications: The city grew smaller after the war. It recovered in the 19th century, when it grew the industrial center. The city declined after the war. It became more important in the nineteenth century, when it grew as an industrial center. The city declined and regained its importance in the nineteenth century, as an industrial center. The city declined after the war. It recovered its importance in the nineteenth century as an industrial center. The city declined after the war. It became important again only in the nineteenth century, when it grew as an industrial center. After the war, the city became less important until the 1800s, when it grew as an industrial center. The city declined after the war. It recovered its importance only in the nineteenth century. This was when it grew as an industrial center. The city declined after the war and became relevant because it became an industrial center in the nineteenth century. The city failed after the war and gained its value only in the 19th century, when it grew as an trade center. After the war, the city refused and recovered its value only in the nineteenth century, when it became an industrial center.