Complex sentence: Headquartered in the United States, the company began in 1940 as a barbecue restaurant operated by Richard and Maurice McDonald; in 1948 they reorganized their business as a hamburger stand using production line principles.
Split into simpler sentences: Headquartered in the United States, the company began in 1940 as a barbecue restaurant operated by Richard and Maurice McDonald. In 1948, they reorganized their business as a hamburger stand using production line principles.