Simplify the following text for a Grade 6 native English-speaking person.
Original: With the Prior Analytics , Aristotle is credited with the earliest study of formal logic , and his conception of it was the dominant form of Western logic until 19th century advances in mathematical logic . Kant stated in the Critique of Pure Reason that Aristotle 's theory of logic completely accounted for the core of deductive inference .
Simplified: Aristotle is the father of logic .