Original sentence: The limousine was originally equipped with a siren, running lights, a 2-way radio, extra-wide running boards, and grab handles for Secret Service agents After the Japanese attack on Pearl Harbor, the Secret Service became more concerned about potential assassination attempts against President Roosevelt
Edited sentence: After the Japanese attack on Pearl Harbor, the Secret Service became more concerned about potential assassination attempts against President Roosevelt.The limousine was originally equipped with a siren, running lights, a 2-way radio, extra-wide running boards, and grab handles for Secret Service agents