Complex sentence: In the United States remotely controlled locomotives have been used since the 1980s, with the Occupational Safety and Health Administration issuing a Hazard Information Bulletin in 1988 regarding their use.
Split into simpler sentences: In the United States remotely controlled locomotives have been in use since the 1980s. In 1988, the Occupational Safety and Health Administration issued a Hazard Information Bulletin regarding their use.