Complex sentence: Standard Valid GUIDs are not chosen at random; they are chosen by standardized algorithms that result in GUIDs that are more reliably unique than ones chosen using even a hypothetically perfect random number generator, and far more reliably unique than numbers chosen by pseudorandom number generators.
Split into simpler sentences: Standard Valid GUIDs are not chosen at random; they are chosen by standardized algorithms. These algorithms result in GUIDs that are more reliably unique than ones chosen using even a hypothetically perfect random number generator, and far more reliably unique than numbers chosen by pseudorandom number generators.