Complex sentence: It concluded that Lee Harvey Oswald acted alone in killing Kennedy and wounding Texas Governor John Connally and that Jack Ruby also acted alone when he killed Oswald two days later.
Split into simpler sentences: It concluded that President Kennedy was assassinated by Lee Harvey Oswald and that Oswald acted entirely alone in killing Kennedy and wounding Texas Governor. It also concluded that Jack Ruby also acted alone when he killed Oswald two days later.