Amid one of the worst stretches for financial performance in Amazon’s history, the new CEO is working to cut back the excesses of an e-commerce operation the company expanded at breakneck pace during much of the Covid-19 pandemicAndy Jassy spent years running one of the fastest-growing divisions in a company famed for its rapid expansion. Nearly a year after taking over as chief executive of Amazon.com Inc., he’s learning how to tap the brakes.