Original sentence: According to both a National Geographic documentary and a Korean newspaper, Tower 2 was successfully completed by Samsung Constructions, Kukdong Engineering & Construction (both of South Korea).However, the builders of Tower 1, Hazama Corporation (Japan), ran into problems when they discovered the structure was 25 millimeters off from vertical.In an unusual move, a different construction company was hired for each of the towers.The shopping mall beneath both towers was constructed by Birmingham, Alabama-based Bill Harbert International.Tower 2 was built by the South Korean multinational Samsung Engineering & Construction and Tower 1 by Hazama Corporation of Japan
Edited sentence: Tower 1 by Hazama Corporation of Japan and Tower 2 was built by the South Korean multinational Samsung Engineering & Construction