Complex sentence: Conditioners are frequently acidic, as low pH protonates the amino acids, providing the hair with positive charge and thus more hydrogen bonds among the keratin scales, giving the hair a more compact structure.
Split into simpler sentences: Conditioners are frequently acidic, as low pH protonates the keratin's amino acids. The hydrogen ions gives the hair a positive charge and creates more hydrogen bonds among the keratin scales, giving the hair a more compact structure.