Complex sentence: Two people, Douglas James Baker (age 15) and Jason Eldridge (age 27) were killed in the incident, one of the largest multi-vehicle collisions in U.S. history, which was blamed on heavy fog.
Split into simpler sentences: Two people, Douglas James Baker (age 15) and Jason Eldridge (age 27) were killed in the incident. It was one of the largest collisions in U.S. history and was blamed on heavy fog.