HASTINGS, Minn. (AP) -- A 60-year-old Minnesota man with 18 drunken-driving convictions will serve 20 months in prison for causing a crash that seriously injured two people in 2017.

Marshall A. Knoll pleaded guilty to first-degree driving while impaired in exchange for the dismissal of two more serious charges. Prosecutors say Knoll was driving with a suspended license and was high on illicit drugs.

Knoll received a 3-year prison sentence, but with credit for time served, what remains of his sentence is 20 months.

Prosecutors say Knoll was speeding in his truck when he rear-ended another vehicle. One of that vehicle's occupants suffered a broken sternum, fractured ribs, a broken arm and bleeding in his brain. Another of the vehicle's passengers required spine surgery.