BERLIN—Mercedes-Benz Cars & Vans expects an adjusted earnings before interest and taxes (EBIT) of 14 billion euros ($15.9 billion) in 2021 and sees supply chain headwinds persisting into 2022, it said on Friday. The luxury carmaker predicted an adjusted return on sales of 12.7 percent in the full year, beating its own guidance of 10 percent-12 percent as the jump in electric vehicle sales made up for supply chain troubles, it said as it released preliminary results. But it expects high raw material prices and semiconductor shortages to prevent it from meeting strong demand for its products this year, Chief Financial Officer Harald Wilhelm told a call with analysts. The chip shortage would ease in the second half of 2022, he said, adding that a “good part” of raw material costs were locked in but unit sales would still need to increase to mitigate the hit from rising costs. “There …