That is a painting of a monkey, inspired by the Year of the Monkey.
Literal
That [topic-は] monkey year [to-に] inspired monkey [gen-の] painting [copula-です].
さる年 'Year of the Monkey' (in the Chinese zodiac/干支). 因む (ちなむ) 'to be associated with / inspired by / named after' is a somewhat literary verb. ~に因んだ is its attributive past form modifying 猿の絵. A clean, cultural-vocabulary sentence about zodiac art.