Simplify the following text for a Grade 9 native English-speaking person.
Original: Burj Khalifa 's construction used 330000 m of concrete and 55,000 tonnes of steel rebar , and construction took 22 million man-hours .
Simplified: Burj Khalifa also used 55,000 tonnes of steel rebar in its construction and it took 22 million man-hours to build .