Simplify the following text for a Grade 8 native English-speaking person.
Original: No gunmen or groups involved in the conspiracy were identified by the committee , but the CIA , Soviet Union , organized crime and several other groups were said to be not involved , based on available evidence .
Simplified: No gunmen or groups involved in the conspiracy were named by the committee . The CIA , Soviet Union , organized crime and several other groups were said to be not involved , based on what they knew at the time .