Complex sentence: The Dallas Area Rapid Transit authority (or DART) is a transit agency based in Dallas, Texas (USA), that operates buses, light rail, commuter rail, and high-occupancy vehicle lanes in Dallas and 12 of its suburbs.
Split into simpler sentences: The Dallas Area Rapid Transit authority (or DART) is a transit agency based in Dallas, Texas (USA). It operates buses, light rail, commuter rail, and high-occupancy vehicle lanes in Dallas and 12 of its suburbs.