The literal translation of "il était malin, celui qui a inventé ce truc-là" in English is "the one who invented that thing was clever".
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A bit of a trivia, French is the official language of many countries including: Switzerland, Canada, Ivory Coast, Luxembourg, Monaco, Congo and Niger. It is spoken by 270 million people worldwide (almost as much as the population of the USA), of which 120 million are native or fluent. There are less than 60 million of White Caucasian native speakers of standard French worldwide.
Discover more interesting facts about France and its language at Eupedia.
Check out Top 12 Tips to Learn French Efficiently shared by FrenchToday.