Complex sentence: In probability theory, L-moments are analogous to conventional moments in that they are used to calculate quantities analogous to the mean, standard deviation, skewness and kurtosis of data.
Split into simpler sentences: In probability theory, L-moments are statistics used to summarize the shape of a probability distribution. They are analogous to conventional moments in that they are used to calculate quantities analogous to the mean, standard deviation, skewness and kurtosis of data.