Simplify the following text for a Grade 12 native English-speaking person.
Original: From a mathematical point of view , the energy conservation law is a consequence of the shift symmetry of time ; energy conservation is a result of the empirical fact that the laws of physics do not change with time itself .
Simplified: The energy conservation law is a consequence of the shift symmetry of time ; energy conservation is implied by the empirical fact that the laws of physics do not change with time itself .