Simplify the following text for a Grade 14 native English-speaking person.
Original: Vivisection ( from Latin vivus `` alive '' + sectio `` cutting '' ) is defined as surgery conducted for experimental purposes on a living organism , typically animals with a central nervous system , to view living internal structure .
Simplified: Vivisection ( from Latin vivus ( `` alive '' ) + sectio ( `` cutting '' ) ) is a doing a surgery as an experiment on a living organism , usually animals .