He later admitted culpable and reckless driving.
Clarke, 60, had his driving licence revoked however was found behind the wheel nine months after the fatal crash.
It was found at a fatal accident inquiry that Clarke lost consciousness at the wheel before the crash in December 2014.
Among those who died in the crash were Stephenie Tait, 29, Jacqueline Morton, 51, both from Glasgow, Erin McQuade, 18, and her grandparents 69-year-old Lorraine and Jack Sweeney, 68, from Dumbarton, and Gillian Ewing, 52, from Edinburgh.
“Now at least they can hopefully start looking to the future and rebuilding their lives.”