Original: On 31 December 1877, a day before the payment of the first installment was due, Courbet died, age 58, in La Tour-de-Peilz, Switzerland, of a liver disease aggravated by heavy drinking.
Simplified: Courbet died at La Tour-de-Peilz, Switzerland, on 31 December 1877, one day before the first payment was due. He was 58 and died of liver disease, made worse by heavy drinking.