Complex sentence: OSHA was established in 1971 under the Department of Labor and is headquartered in Washington, District of Columbia with ten regional offices, further broken down into districts, each organized into three sections; compliance, training, and assistance.
Split into simpler sentences: OSHA was established in 1971 under the Department of Labor. It has headquarters in Washington, DC and ten regional offices, further broken down into districts, each organized into three sections; compliance, training, and assistance.