China cut in half the length of time inbound travelers must spend in quarantine, making it easier for citizens to return and foreign companies to tend to business in the world’s second-largest economy after two-and-a-half years of isolation. Experts on topics from economics to health to business welcomed the move, though they said the reduction to 10 days of quarantine, from as long as three weeks previously, was just a first step toward reintegrating with the world. Health leaders in China s...