Complex sentence: Wavicles are the point sources used in Huygens' principle, which states that all points on a wave front can be considered as point sources, e.g. wavicles, from which spherical waves propagate outwards.
Split into simpler sentences: Wavicles are the point sources used in Huygens' principle. That all points on a wave front can be considered as point sources, e.g. wavicles, from which spherical waves propagate outwards.