Complex sentence: A second group of users of quantile functions are those involved in (Monte-Carlo) simulation, who make use of quantile functions to produce random non-uniform deviates for use in diverse types of simulation calculations.
Split into simpler sentences: A second group of users of quantile functions are those involved in (Monte-Carlo) simulation. They make use of quantile functions to produce random, non-uniform deviates for use in diverse types of simulation calculations.