Complex sentence: An autopsy conducted on February 19,2001 concluded that Earnhardt died instantly of blunt force trauma to his head due to the accident, and it also reported that Earnhardt sustained a fatal basilar skull fracture.
Split into simpler sentences: An autopsy conducted on February 19,2001 concluded that Earnhardt died instantly of blunt force trauma to his head due to the accident. It also reported that Earnhardt sustained a fatal basilar skull fracture.