。
Mr. Kinoshita left his glasses behind at the office yesterday.
Literal
Kinoshita-san [topic-は] yesterday glasses [object-を] office [at-に] left-and-forgot.
置き忘れる ('to leave and forget') is a compound verb composed of 置く ('to place') + 忘れる ('to forget') — literally 'to forget after placing,' i.e. 'to leave behind by mistake.' Compounding two verbs is one of the most productive ways to form precise lexical meanings in Japanese: the first verb adds the manner or precondition, the second verb the main action.