Complex sentence: In 1958,26 students from the high school and local grades schools died, along with the bus driver, in the Prestonburg bus disaster, which is tied for the worst bus accident in US history with the 1988 Carrollton bus disaster which also occurred in Kentucky.
Split into simpler sentences: In 1958,26 students from the high school and local grades schools died, along with the bus driver, in the Prestonburg bus disaster. The accident is tied for the worst bus accident in United States history with the 1988 Carrollton bus disaster, which also occurred in Kentucky.