Simplify the following text for a Grade 14 native English-speaking person.
Original: Modern spectroscopes , such as monochromators , generally use a diffraction grating , a movable slit , and some kind of photodetector , all automated and controlled by a computer .
Simplified: Modern spectroscopes generally use a diffraction grating , a movable slit , and some kind of photodetector , all automated and controlled by a computer .