Complex sentence: In 1823 however Stannard was in a severe financial crisis which was temporarily alleviated by the patronage of the Norwich manufacturer and entrepeneur John Harvey, who commissioned him to paint what is Stannard's masterwork, "Thorpe Water frolic-afternoon".
Split into simpler sentences: In 1823 however Stannard was in a severe financial crisis which was temporarily alleviated by the patronage of the Norwich manufacturer and entrepeneur John Harvey. Harvey comissioned Stannard to paint what is Stannard's masterwork, "Thorpe Water frolic-afternoon".