Complex sentence: He became a director of the renamed Trans-Continental Bus system, which operated in time in more than forty states and became a forerunner of Continental Trailways, later absorbed by Greyhound Lines.
Split into simpler sentences: He became a director of the renamed Trans-Continental Bus system, which operated in time in more than forty states. It was a forerunner of Continental Trailways, later absorbed by Greyhound Lines.