BEAUMONT — A second Port Arthur teen has been sentenced in relation to a violent store robbery. Jefferson County District Attorney Keith Giblin announced on June 2 that 18-year-old Jayden Lamar Simon of Port Arthur was sentenced to 20 years in prison by Jefferson County District Judge Raquel West. West accepted the plea of guilty from Simon to the felony offenses of aggravated robbery and robbery before sentencing Simon pursuant to an agreed pun…