Simplify the following text for a Grade 13 native English-speaking person.
Original: The German Gottfried Wilhelm Leibniz during 1676-1689 attempted a mathematical formulation of the kind of energy which is connected with motion ( kinetic energy ) .
Simplified: It was Gottfried Wilhelm Leibniz during 1676 â `` 1689 who first attempted a mathematical formulation of the kind of energy which is connected with motion ( kinetic energy ) .