Complex sentence: In the basic version of this experiment, a coherent light source such as a laser beam illuminates a plate pierced by two parallel slits, and the light passing through the slits is observed on a screen behind the plate.
Split into simpler sentences: In the basic version of this experiment, a coherent light source such as a laser beam illuminates a plate with two parallel slits. The light passing through the slits is observed on a screen behind the plate.